Bipolar Disorder
Symptoms, Causes & Treatment
Everything you need to know about bipolar disorder: what causes it, how it is diagnosed, and the effective treatments available.
What Is Bipolar Disorder?
Bipolar disorder is a serious, long-term mental health condition characterised by episodes of extreme mood states – typically alternating between periods of elevated or euphoric mood (mania or hypomania) and periods of depression. These mood episodes can be profoundly disabling, affecting every area of a person's life including relationships, employment, finances, and physical health.
Bipolar disorder affects approximately 2% of the UK population, with men and women equally affected. It typically first presents in late adolescence or early adulthood, though it can emerge at any age. Between mood episodes, many people with bipolar disorder function normally, though some experience persistent residual symptoms.
Bipolar disorder is classified into several subtypes:
Bipolar I Disorder – defined by the presence of at least one manic episode lasting at least 7 days (or requiring hospitalisation). Depressive episodes also typically occur. Manic episodes in Bipolar I can be severely impairing and may involve psychotic features (delusions or hallucinations).
Bipolar II Disorder – characterised by at least one major depressive episode and at least one hypomanic episode, but no full manic episodes. Hypomania is less severe than mania and does not cause the same degree of impairment or psychosis, but Bipolar II is often more dominated by depression than Bipolar I.
Cyclothymic Disorder (Cyclothymia) – a chronic pattern of hypomanic and depressive symptoms that do not meet the full criteria for hypomanic or major depressive episodes, persisting for at least two years. Often thought of as a milder bipolar spectrum condition.
Bipolar disorder is frequently misdiagnosed, particularly in its early stages. Bipolar II is particularly prone to being misidentified as unipolar depression (the hypomanic episodes may not be recognised as problematic and may even feel positive), which can have serious clinical consequences – notably the prescribing of antidepressants without a mood stabiliser, which can trigger mania or rapid cycling.
What Are the Symptoms of Bipolar Disorder?
Bipolar disorder produces episodes of two opposite mood states, each with a distinctive symptom profile. Between episodes, mood may return to normal. Some people experience mixed states where features of both occur simultaneously.
- Elevated or expansive mood, feeling unusually high or euphoric
- Markedly increased energy, activity, and goal-directed behaviour
- Decreased need for sleep (feeling rested after 3–4 hours)
- Racing thoughts and rapid speech (pressure of speech)
- Inflated self-esteem or grandiosity
- Impulsive, reckless behaviour: spending, sexual, risk-taking
- Irritability or agitation
- In severe mania: psychotic features (delusions or hallucinations)
- Persistent low mood, sadness, or emptiness
- Loss of interest or pleasure in activities
- Fatigue and low energy
- Changes in appetite and weight
- Sleep disturbance — insomnia or hypersomnia
- Difficulty concentrating or making decisions
- Feelings of hopelessness, worthlessness, or guilt
- Thoughts of death or suicide
Bipolar disorder carries a significantly elevated suicide risk — approximately 20 to 30 times higher than the general population. If you or someone you know is experiencing suicidal thoughts, please seek help immediately. Call 999 or go to A&E if in immediate danger. The Samaritans are available 24 hours a day on 116 123.
What Causes Bipolar Disorder?
Bipolar disorder arises from a complex interaction of genetic vulnerability, neurobiological differences, and environmental triggers. It is not caused by weakness or personal choice.
Bipolar disorder involves dysfunction in brain circuits regulating mood, reward, energy, and sleep. Dopaminergic and serotonergic pathways are both implicated. Neuroimaging studies show structural and functional differences in the prefrontal cortex and limbic system compared with those without the condition.
Bipolar disorder is one of the most heritable psychiatric conditions, with genetic factors accounting for approximately 60–80% of risk. Having a first-degree relative with bipolar disorder increases lifetime risk by approximately tenfold. Multiple genes influencing serotonin, dopamine, and calcium signalling have been implicated.
Manic and depressive episodes are commonly triggered by life stressors, sleep disruption, significant life changes (positive or negative), substance use, and hormonal shifts including the postpartum period. Identifying and managing personal triggers is a core component of long-term bipolar management.
Alcohol, stimulants, and cannabis can precipitate manic or mixed episodes, and depressants can worsen depressive phases. Substance use significantly complicates bipolar disorder and worsens prognosis. It is common as a form of self-medication for mood instability.
Bipolar disorder is frequently misdiagnosed as depression, ADHD, borderline personality disorder, or schizophrenia. The average delay between symptom onset and correct diagnosis is around nine years. Many people are treated for depression alone for years before a manic or hypomanic episode reveals the full bipolar picture.
Psychological and relationship stress, childhood trauma, and major life disruptions can destabilise mood in those with bipolar vulnerability. High levels of expressed emotion in close relationships and irregular routines that disrupt circadian rhythms are both associated with increased episode frequency.
Key Risk Factors
How Is Bipolar Disorder Diagnosed?
Bipolar disorder is diagnosed clinically. There are no blood tests. Diagnosis requires identifying a lifetime pattern of mood episodes through thorough psychiatric assessment. Because most people first present during depression, hypomania or mania is frequently missed. Specialist psychiatric assessment is required to confirm the diagnosis.
How Is Bipolar Disorder Treated?
Bipolar disorder requires lifelong treatment. The cornerstone is mood-stabilising medication. Psychological therapies — particularly psychoeducation and CBT — are effective adjuncts. Management of acute episodes differs from maintenance treatment.
Supportive Measures
Sleep regularity is paramount — irregular sleep is the most common relapse trigger. Maintaining a daily mood diary helps identify patterns and early warning signs. Regular moderate exercise, reducing alcohol and stimulants, eating regular meals, and maintaining social connections all contribute to stability. Psychoeducation significantly improves long-term outcomes.
Recurrent Episodes & Long-Term Management
Bipolar disorder is by definition recurrent. With appropriate long-term mood stabiliser treatment, the frequency and severity of episodes can be dramatically reduced. Rapid cycling bipolar (four or more episodes per year) is more complex to treat and often requires specialist input. Regular contact with a psychiatrist and community mental health team is essential for complex presentations.
When Should You Seek Medical Advice for Bipolar Disorder?
You or someone you know is experiencing active suicidal ideation or has made a plan · There is acute mania with dangerous behaviour or psychosis · There is a postpartum mood episode · A person is unable to care for themselves or dependants due to severity of episode.
You are experiencing a mood episode affecting your functioning · Your current mood stabiliser does not appear to be working · You think you may have bipolar and have never been assessed · You are pregnant or postpartum and have bipolar disorder · Episodes are becoming more frequent or severe.
How Can You Manage Bipolar Disorder & Prevent Episodes?
Bipolar disorder cannot be cured, but episodes can be substantially reduced in frequency and severity through consistent medication, lifestyle management, and early recognition of warning signs.
Taking mood stabilisers consistently, even when feeling well, is the most important factor in preventing relapse. Stopping lithium or valproate abruptly significantly increases relapse risk and, in the case of lithium, can cause a rebound episode that is more severe than the original.
Sleep disruption is the most common trigger for manic episodes. Going to bed and waking at the same time every day, avoiding late nights, and managing any sleep disorders are critical components of bipolar management.
Learning to recognise personal early warning signs of mania (decreased sleep, increased energy, racing thoughts) or depression (withdrawal, fatigue, hopelessness) allows early intervention before a full episode develops. A written relapse prevention plan developed with a clinician is invaluable.
Alcohol and recreational drugs — particularly cannabis, cocaine, and stimulants — destabilise mood, interfere with medications, and significantly increase relapse risk. Addressing substance use is an essential part of bipolar management.
Stress is a major trigger for mood episodes. Identifying stressors, developing coping strategies, maintaining social routines, and reducing unnecessary commitments during vulnerable periods all help maintain mood stability.
Regular exercise, a balanced diet, and avoiding excessive caffeine all support mood stability. Physical activity has strong evidence for reducing depressive symptoms in bipolar disorder and improves overall wellbeing and medication tolerability.
Speak to a Clinician About Bipolar Disorder
If you are experiencing mood episodes that may suggest bipolar disorder, or are already diagnosed and need a medication review, The GP Service can help. Speak to a licensed clinician in a confidential online consultation for assessment, referral, or medication review.
Expert clinical advice, when you need it.
Bipolar Disorder FAQs
Bipolar disorder is a lifelong mood condition characterised by recurring episodes of mania or hypomania (elevated, expansive, or irritable mood with increased energy) and depression. It differs from unipolar depression in that it involves distinct periods of abnormally elevated mood, not just low mood. Bipolar I involves full manic episodes (which may include psychosis); Bipolar II involves hypomanic episodes (less severe, no psychosis) alongside depressive episodes. Cyclothymia involves milder, more chronic mood cycling.
Bipolar disorder is frequently misdiagnosed because most people first present during a depressive episode, and hypomania or mania may not be recognised as abnormal by the person themselves or their clinician. Average time from first symptoms to correct diagnosis is over five years. Key clues suggesting bipolar rather than unipolar depression include: episodes of unusual energy, reduced need for sleep, impulsivity or recklessness, antidepressants causing agitation or elevated mood, strong family history, and early onset of depression (before age 25).
Lithium is the most evidence-based mood stabiliser for bipolar disorder. It is effective for preventing both manic and depressive episodes, reduces suicide risk, and has been used for over 70 years. It requires regular blood monitoring (every 3–6 months when stable) to check lithium levels, kidney function, and thyroid function. Side effects at therapeutic levels are usually mild (thirst, polyuria, mild tremor). Lithium toxicity — which can occur if levels rise too high — is serious and requires prompt assessment. Adequate hydration and avoiding NSAIDs are important for those taking lithium.
Antidepressants are not generally recommended as standalone treatment for bipolar disorder. In some people, they can trigger a switch into hypomania or mania, or destabilise mood cycling. NICE advises against using antidepressants without a concomitant mood stabiliser. If depression is severe, quetiapine or lamotrigine are preferred. Where antidepressants are used, they should be short-term, at the lowest effective dose, and combined with a mood stabiliser. This is one reason why correct diagnosis is so important before starting antidepressant treatment.
Bipolar disorder significantly increases the risk of suicide and self-harm. Studies suggest the lifetime risk of suicide in bipolar disorder is 20–30 times higher than in the general population. This risk is highest during depressive episodes, mixed states, and the period immediately after hospital discharge. If you or someone you know with bipolar disorder is experiencing thoughts of self-harm or suicide, seek help immediately — call 999, go to A&E, or call the Samaritans on 116 123.
Yes. Women with bipolar disorder face specific challenges including menstrual cycle–related mood changes, the need for careful medication management in pregnancy (several mood stabilisers are teratogenic), and a very high risk of postpartum psychosis or severe mood episode after childbirth. Sodium valproate must not be used in women of childbearing potential due to significant teratogenic risk. Women planning a pregnancy should discuss medication options with a specialist well in advance. Postpartum mania and psychosis require emergency psychiatric assessment.
Yes. Bipolar disorder is a chronic condition, but many people with the right treatment and self-management achieve long periods of mood stability and live fulfilling lives. The most important protective factors are: consistent medication, maintaining regular sleep, avoiding alcohol and substances, early recognition of warning signs, and strong social support. Psychoeducation — learning about the condition, triggers, and relapse prevention — significantly improves long-term outcomes. Regular contact with a clinician for monitoring and medication management is also essential.
Bipolar disorder and ADHD share several overlapping features — including impulsivity, emotional dysregulation, distractibility, and restlessness — which can make differential diagnosis challenging. They also frequently co-occur, with around 20% of people with bipolar disorder also meeting criteria for ADHD. ADHD symptoms are persistent and present across all moods, whereas bipolar symptoms are episodic. Careful assessment by a specialist is needed to distinguish the conditions and treat both appropriately when present.