Bipolar disorder key symptoms

Bipolar disorder is often associated with dramatic mood swings, but the reality is usually more complicated. Many people spend years trying to understand changes in their mood, energy, sleep and behaviour before receiving a diagnosis. Some seek help for depression without realising that periods of unusually high energy, confidence or reduced need for sleep may also be part of the picture.

That can make bipolar disorder difficult to recognise, both for the person experiencing it and for the people around them. Symptoms can look different from one person to the next, and many overlap with other mental health conditions. The key difference is often the pattern that develops over time rather than any single symptom on its own.

This guide explains the most common symptoms of bipolar disorder, including mania, hypomania, depression and mixed episodes. It also covers early warning signs, common triggers, how bipolar disorder is diagnosed and treated in the UK, and when to seek support.

If you or someone you are with is in immediate danger, call 999 or go to A&E. If you need urgent mental health support, you can use NHS 111 and the NHS guidance on where to get urgent help for mental health. Contact Samaritans for a listening ear at any time.

Bipolar disorder symptoms overview

Bipolar disorder is defined by mood episodes that go beyond ordinary ups and downs. The NHS describes the core pattern as extreme changes in mood, including highs (mania or hypomania) and lows (depression), with periods of stability in between for many people.

What makes these episodes different from normal ups and downs is their intensity and how much they affect daily life. A bipolar episode usually lasts for days or weeks rather than a few hours.

During that time, a person may sleep much more or much less than usual, feel unusually energetic or exhausted, find their thoughts racing or slowing down, and behave in ways that are out of character. These changes are often noticeable to family, friends or colleagues.

Episodes can also affect judgement, which means a period of feeling unusually confident or energetic can sometimes lead to decisions that feel right at the time but cause problems later.

If you are reading this and thinking, “Does this mean I definitely have bipolar disorder?”, the realistic answer is no. Many conditions can affect mood and energy, and life stress can mimic some features.

Still, if you notice repeated patterns of clear depressive episodes plus distinct periods of unusually elevated or irritable mood, it’s worth booking an appointment with your GP.

A helpful way to scan for patterns is to look at four areas over time:

• Mood – unusually high, unusually irritable or unusually low
• Energy and activity – driven and restless, or slowed down and depleted
• Thinking – racing thoughts and grand plans, or negative and hopeless thinking
• Behaviour – spending, sex, substances, arguments, avoidance or withdrawal that feels out of character

When those shifts line up in clusters and recur, that “episode pattern” becomes a strong clue.

Mania symptoms and warning signs

Mania is more than feeling happy. It’s a state of elevated or irritable mood with increased energy and activity that can affect relationships, work, finances and personal safety.

Some people enjoy parts of it at first because they feel more confident, productive or driven than usual. However, they may also talk more quickly, take on ambitious plans, start multiple projects, or make decisions they wouldn’t normally make.

As the episode develops, it can become harder to recognise risks or think through the possible consequences of those decisions.

Common warning signs include:

• Sleeping far less than usual and still feeling full of energy
• Feeling unusually happy, confident or important, sometimes with grand plans
• Feeling talented, creative and insightful
• Talking more, louder or faster than usual, and becoming unusually outgoing or sociable
• Racing thoughts, or feeling like your mind won’t slow down
• Starting unrealistic tasks or making big life decisions quickly without thinking them through
• Getting easily irritated or aggressive, especially if others disagree
• Spending more, gambling or making impulsive purchases
• Changes in sex drive, sexual risk-taking or boundary changes
• Using more alcohol or drugs, or feeling “immune” to the effects
• Being highly distractible, restless and unable to sit still

Mania can also include psychotic symptoms in some cases, such as hallucinations or strong beliefs that are out of keeping with reality. That is one reason severe mania can become an emergency.

One key point is that during mania, people often don’t feel unwell. They may feel better than well. Therefore, friends and family sometimes notice the change before the person does. If someone seems dramatically unlike themselves, sleeps very little and makes risky choices, take it seriously even if they insist that they are fine.

Hypomania symptoms vs. mania – what’s the difference?

Mania and hypomania involve many of the same symptoms. The main difference is severity.

During hypomania, people often experience increased energy, confidence, activity and reduced need for sleep, but they are usually able to continue working, studying, or managing daily responsibilities. Friends, family, or colleagues may notice a clear change in mood or behaviour, even if the person feels well.

Mania is more severe and can have a much greater impact on day-to-day life. It is more likely to lead to risky decisions, significant disruption or the need for urgent medical support.

Because hypomania can feel productive, enjoyable or motivating, many people struggle to recognise it as a symptom. It is often only when episodes repeat, lead to consequences, or are followed by depression that the pattern becomes clearer.

Bipolar depression symptoms checklist

Bipolar depression can look very similar to other forms of depression. The difference is not usually in the symptoms themselves but the wider pattern over time, including past periods of hypomania or mania.

During a depressive episode, you may notice:

• Low mood, emptiness or feeling numb
• Loss of interest or pleasure in things you usually enjoy
• Low energy, fatigue and slowed movement or thinking
• Sleeping much more, or insomnia and early waking
• Appetite changes and weight changes
• Difficulty concentrating or making decisions
• Feelings of worthlessness, guilt or self-blame
• Hopelessness about the future
• Thoughts of self-harm or suicide

Bipolar depression can also include agitation and anxiety, so it can feel like:

• Restlessness and irritability
• A tight chest or constant worry
• Racing negative thoughts or rumination

If you are unsure what counts as a bipolar episode, it can help to compare your current state with your usual baseline. Ask yourself: “Is this a clear change in my sleep, energy and thinking, and has it lasted for days rather than hours?”

If depression becomes overwhelming, if you have thoughts of self-harm or suicide, or if you feel unable to keep yourself safe, seek support as soon as possible. This might involve contacting your GP, NHS 111, a mental health crisis service, or calling 999 in an emergency. 

Mixed episode symptoms explained

Mixed episodes (often called “mixed features” or “mixed states”) can be especially distressing. They happen when symptoms of depression and mania or hypomania occur at the same time, or when they flip quickly within the same episode.

Mixed states can look like:

• Feeling very low, yet unable to sleep
• Racing thoughts focused on guilt, fear or self-criticism
• High agitation, pacing and irritability with tearfulness
• Feeling driven to act, yet feeling empty or desperate
• Increased risk-taking combined with despair
• Feeling “trapped in your body” or like you cannot switch off

Mixed states can increase risk because energy rises while mood remains low. That combination can make the urge to self-harm feel more intense and more likely to be acted on. If you recognise mixed symptoms, seek clinical advice promptly rather than waiting for it to pass.

Early signs of bipolar disorder

People often look back and realise they had early signs years before diagnosis. That delay is common. It often happens because early hypomania can be subtle, and early depression can look like “ordinary depression”.

Early signs can include:

• Depressive episodes that start in teens or early adulthood, especially if they recur
• Antidepressants that seem to trigger agitation, insomnia or unusually elevated mood
• Repeated periods of reduced sleep with increased energy and confidence
• “Out of character” bursts of spending, risk-taking or intense social activity
• Strong seasonal patterns, such as highs in spring or summer and lows in winter
• A family history of bipolar disorder, although not everyone has this

Another early clue is how someone responds to sleep loss. Most people feel tired and run down after poor sleep. In bipolar disorder, reduced sleep can sometimes be followed by increased energy, irritability, racing thoughts or symptoms of hypomania. If you notice that pattern, track it. It can be valuable information during an assessment.

If you suspect that you may have bipolar disorder, start thinking about it from a place of curiosity rather than certainty. Don’t aim to label yourself, but strive to gather enough accurate detail that a clinician can assess the pattern properly.

What triggers bipolar symptoms?

Triggers do not cause bipolar disorder on their own, but they can set off episodes in someone who is vulnerable. Knowing your triggers can help you recognise patterns and create an early warning system.

We look at common triggers below.

Sleep disruption

Sleep is one of the most important triggers and early warning signs in bipolar disorder. Changes in sleep can happen because of shift work, travel, illness, new parenting responsibilities, stress or simply staying up later than usual.

Many people with bipolar disorder notice that reduced sleep is followed by increased energy, irritability, racing thoughts or symptoms of hypomania and mania. During depressive episodes, the opposite pattern can occur, with oversleeping, fragmented sleep or difficulty getting out of bed.

Because sleep and mood are closely linked, it is often one of the first things clinicians ask about during an assessment.

Stressful life events

Major life events can trigger episodes, particularly when they affect routines, relationships or sleep.

Common examples include:

• Bereavement
• Relationship breakdown
• Job loss
• Financial difficulties
• Caring responsibilities

Stress does not affect everyone in the same way, but many people notice a connection between periods of prolonged stress and changes in mood.

Positive life changes and routine disruption

Triggers are not always negative.

Events such as travel, celebrations, promotions, moving house or starting a new relationship can disrupt routines, increase activity levels, and reduce sleep. For some people, those changes can contribute to a mood episode in the same way that stressful events can.

Alcohol, drugs and medication changes

Alcohol and recreational drugs can affect mood stability, sleep quality and decision-making. Stimulants and heavy cannabis use are particularly associated with mood changes in some people.

Medication changes can also play a role. This may include stopping mood stabilisers suddenly or, in some cases, taking antidepressants that trigger symptoms of hypomania or mania.

Hormonal and seasonal changes

Some people notice changes in symptoms around hormonal shifts, including the postnatal period or perimenopause.

Others experience seasonal patterns, such as higher mood and increased energy during spring and summer, followed by depressive symptoms during darker months.

Spotting early warning signs

Triggers are often easiest to recognise in hindsight. Many people notice a pattern where a change in sleep, routine, stress level or medication is followed by changes in mood, energy, thinking or behaviour.

For example, you may sleep less for several nights, start feeling unusually energised or irritable, and then begin making impulsive decisions or taking on more than usual. Identifying those patterns early can make it easier to seek support before symptoms escalate.

Getting a bipolar disorder diagnosis in the UK

There is no single test for bipolar disorder. Instead, diagnosis is based on patterns of symptoms over time.

A GP is often the first step. They can explore your symptoms, rule out physical health problems that may affect mood, and refer you to specialist mental health services for assessment. In many areas, diagnosis and medication initiation sit with secondary care services such as a community mental health team (CMHT) or a psychiatrist.

One reason bipolar disorder can be difficult to diagnose is that many people seek help during depressive episodes. Unless someone is also asked about periods of unusually high energy, reduced need for sleep, increased confidence, impulsive behaviour or elevated mood, bipolar disorder can sometimes be mistaken for depression alone.

During an assessment, clinicians look beyond individual symptoms and focus on the overall pattern. They may ask:

• How long episodes last
• How often they occur
• Whether symptoms affect work, relationships, finances or daily life
• Changes in sleep, energy, activity levels and thinking speed
• Whether there have been periods of mania, hypomania, depression or mixed symptoms
• Any family history of bipolar disorder or other mental health conditions

The pattern of episodes also helps determine the diagnosis. Bipolar I involves at least one episode of mania. Bipolar II involves hypomanic episodes alongside depressive episodes. Some people experience mixed features, where symptoms of depression and mania occur at the same time. Others experience rapid cycling, which means four or more mood episodes within a year.

Because bipolar disorder is diagnosed based on patterns rather than single symptoms, keeping records can be extremely helpful. If you are waiting for an assessment, consider tracking:

• Mood changes across weeks and months
• Sleep length and sleep need, especially reduced sleep without tiredness
• Energy, activity level and restlessness
• Spending, risk-taking, alcohol and drug use
• Racing thoughts, pressured speech or irritability
• Any psychotic experiences, such as hearing voices or unusual beliefs
• The impact on work, relationships, finances or daily life

It can also help to bring information from a trusted partner, relative or friend who has observed changes in your behaviour. Memory can be patchy during manic or hypomanic episodes, so another perspective can sometimes help build a clearer picture.

If you have symptoms of mania, severe agitation, psychosis or you have gone several nights without sleep and your energy continues to rise, do not wait for a routine appointment. Seek urgent help through NHS 111, your local mental health crisis service, or 999 if there is an immediate risk to your safety or someone else’s.

Bipolar disorder vs. other conditions

Many bipolar symptoms can overlap with other mental health conditions. That is one reason diagnosis can take time, particularly when someone seeks help during a depressive episode or when symptoms don’t seem to fit neatly into one category.

For example, bipolar disorder and ADHD can both involve impulsivity, distractibility, restlessness, racing thoughts, and periods of high energy. However, ADHD symptoms are usually persistent and often begin in childhood. Bipolar symptoms tend to be episodic, with noticeable changes from a person’s usual baseline in mood, energy, sleep and behaviour.

Bipolar disorder can also be confused with borderline personality disorder (BPD), sometimes called emotionally unstable personality disorder (EUPD). Both conditions can involve intense emotions, impulsive behaviour and relationship difficulties. A key difference is that bipolar mood episodes typically last days or weeks and are often accompanied by changes in sleep, energy levels and thinking speed. In BPD, emotional shifts may happen more quickly and are often linked to interpersonal stress, rejection or fears of abandonment.

Depression is another common source of confusion. Many people with bipolar disorder first seek help during a depressive episode, and if past periods of mania or hypomania are not recognised, bipolar disorder can sometimes be mistaken for depression alone.

Sleep patterns can provide useful clues. During mania or hypomania, people often need far less sleep without feeling tired. In depression, sleep may increase or become disrupted. Changes in sleep are less central to conditions such as ADHD and are not usually the main driver of emotional changes in BPD.

Real life is rarely straightforward. Some people have more than one condition, and symptoms can overlap significantly. This is why mental health professionals look at patterns over time rather than relying on a single symptom or checklist. Understanding these differences can help you describe your experiences more clearly during an assessment, but only a qualified clinician can make a diagnosis.

How bipolar disorder is treated in the UK

Treatment for bipolar disorder usually involves a combination of medication, psychological support and practical strategies that help you recognise and manage mood changes over time.

The right treatment depends on the symptoms you experience, whether you are currently depressed, hypomanic, manic or stable, and how previous treatments have worked. Your treatment may be adjusted over time as clinicians learn more about your pattern of episodes and response to different approaches.

Medications for bipolar disorder

Medication is one of the main treatments for bipolar disorder and is often used to manage current symptoms and reduce the risk of future episodes.

Common medications include mood stabilisers such as lithium, alongside antipsychotic medicines such as quetiapine, olanzapine, risperidone or haloperidol. Different medications may be used depending on whether you are experiencing mania, depression, mixed symptoms or a period of stability.

For example, medications used during a manic episode may differ from those used to reduce the risk of future episodes. Treatment plans are often reviewed and adjusted as symptoms change.

Antidepressants can be more complicated in bipolar disorder than in depression alone. While some people benefit from them, antidepressants can sometimes trigger hypomania, mania or increased mood instability. For this reason, clinicians are usually cautious about antidepressant-only treatment when bipolar disorder is suspected.

All bipolar medications should be taken under the supervision of a doctor or specialist. Treatment decisions are based on your symptoms, physical health, other medications, previous responses to treatment and possible side effects.

What if I am prescribed lithium?

Lithium is one of the most commonly used long-term treatments for bipolar disorder and has been used for many decades. It can be very effective at reducing the frequency and severity of mood episodes for some people.

The drug requires regular blood tests to make sure the dose remains safe and effective. Your healthcare team will explain what monitoring is needed and how often it should take place.

Like all medications, lithium can cause side effects, but these vary from person to person. If lithium is recommended, your doctor can explain the potential benefits, risks, side effects and monitoring requirements so that you can make an informed decision about treatment.

Psychological support

Medication is only one part of treatment for bipolar disorder.

Many people benefit from psychological support that helps them understand their symptoms, recognise warning signs and manage the impact bipolar disorder can have on work, relationships, confidence and day-to-day life.

Support may include:

• Psychoeducation about bipolar disorder
• Cognitive behavioural therapy (CBT)
• Relapse prevention planning
• Support for anxiety, depression, or trauma
• Family-focused interventions where appropriate

Learning how your own episodes develop can be particularly valuable. Many people gradually identify personal warning signs that appear before a significant mood change, which allows them to seek support earlier.

Sleep, routine and relapse prevention

Sleep is often a central part of bipolar management.

Changes in sleep can be both a symptom and a trigger. For some people, reduced sleep is one of the earliest signs that hypomania or mania may be developing. Others notice worsening depression when sleep becomes disrupted or excessive.

Because of this, many treatment plans focus on maintaining regular daily routines and protecting sleep where possible.

Practical strategies may include:

• Keeping a consistent wake-up time
• Limiting caffeine later in the day
• Reducing alcohol intake
• Managing shift work where possible
• Responding early to changes in sleep patterns

Many people also find mood tracking helpful. Recording sleep, mood, energy levels and possible triggers can make patterns easier to recognise and provide useful information during appointments.

Working with your care team

Bipolar disorder is usually managed over the long term rather than treated with a single intervention. It can take time to understand your symptoms, identify patterns and find the combination of support that works best for you.

Over time, you may need adjustments to medication, support strategies or relapse prevention plans. Regular reviews give you an opportunity to discuss side effects, changes in symptoms, warning signs and any concerns you have about your treatment.

More than just responding to episodes when they happen, the aim is to help you recognise early warning signs, reduce the impact of future episodes and maintain the stability and quality of life that matter to you.

When and how to seek urgent help in the UK

Some bipolar symptoms require urgent assessment, particularly when there are concerns about safety or someone is struggling to stay in touch with reality.

Seek urgent help if you or someone you are with has:

• Severe mania with risky behaviour, aggression or inability to care for self
• Psychotic symptoms, such as hallucinations or strongly held beliefs that feel out of character
• Suicidal thoughts with intent, plans or escalating risk
• A mixed state with agitation plus hopelessness or self-harm urges
• Several nights of very little sleep with escalating energy and poor judgment
• Sudden major deterioration after stopping medication

If you need urgent help for your mental health, call NHS 111 and select the mental health option. The service is available 24 hours a day and can connect you with local crisis support, mental health professionals, and urgent assessment services where appropriate.

If there is an immediate risk to your safety or someone else’s, call 999 or go to A&E. This includes situations involving serious self-harm, suicide attempts, severe psychotic symptoms or behaviour that puts someone in immediate danger.

How friends and family can help safely

Supporting someone with bipolar disorder can feel difficult, particularly during periods of mania, depression or mixed symptoms. While you cannot control another person’s mood, there are practical ways to help.

Learn their warning signs

Early signs often appear before a full episode develops. These can include:

• Sleeping much more or much less than usual
• Increased energy, confidence or impulsive behaviour
• Withdrawing from friends and family
• Changes in spending, risk-taking or substance use
• Noticeable changes in mood, irritability or activity levels

Offer support without judgement

During an episode, people may not recognise what is happening or may struggle to explain how they feel.

Helpful approaches include:

• Listening without criticism or confrontation
• Encouraging professional support where appropriate
• Offering practical help with appointments or daily tasks
• Checking in regularly and staying connected
• Plan ahead when things are stable

Many people find it helpful to discuss support preferences before a crisis develops.

This might include:

• Agreeing on early warning signs to watch for
• Discussing who should be contacted if symptoms worsen
• Creating a plan for managing sleep disruption or risky behaviour
• Identifying local support services in advance

Remember to look after yourself, too

Supporting someone with bipolar disorder can be rewarding, but it can also be stressful, frustrating, and emotionally exhausting at times. You may find yourself worrying about their safety, monitoring changes in mood or taking on extra responsibilities during difficult periods.

It is important to remember that you cannot manage another person’s condition on your own. Supporting someone does not mean being available at all times or carrying sole responsibility for their well-being. Maintaining your own routine, relationships and support network can help you provide more sustainable support over the long term.

If you are regularly supporting someone with bipolar disorder, consider speaking to your GP, a carers’ organisation, or a support group if you need advice or support for yourself.

If you believe someone is at immediate risk of harming themselves or others, seek urgent help through NHS 111, local crisis services or 999 in an emergency.

Further guidance:

• Bipolar disorder, NHS
• Where to get urgent help for mental health, NHS 
• Bipolar mood episodes and symptoms, Mind
• Bipolar disorder, Royal College of Psychiatrists
• Bipolar UK 
• Samaritans