Bipolar disorder causes dramatic shifts in mood, energy, and behavior that go far beyond normal ups and downs. The core symptoms fall into two poles: periods of abnormally elevated mood and energy (mania or hypomania) and periods of deep depression. Most people first develop symptoms around age 30, though onset in the teens or early twenties is common. What makes bipolar disorder tricky to recognize is that the symptoms look very different depending on which phase a person is in, and some features, like cognitive problems and physical health changes, persist even between episodes.
Symptoms of Mania
A manic episode is the hallmark of bipolar I disorder. During mania, your mood becomes abnormally elevated, expansive, or intensely irritable for at least a week. You may feel euphoric and unstoppable one moment, then agitated and aggressive the next. This mood lability is one of the most recognizable features.
The behavioral symptoms tend to cluster together. You talk more and faster than usual. Your thoughts race, jumping from topic to topic in a way that’s hard for others to follow. You need significantly less sleep, sometimes going days on just a few hours without feeling tired. You become easily distracted, and your energy surges into goal-directed activity: launching new projects, spending large amounts of money, traveling impulsively, or pursuing risky sexual encounters. Many people in a manic phase feel grandiose, believing they have special abilities, connections, or importance that don’t match reality.
Mania can also turn dangerous. Some people become physically or verbally aggressive, damage property, or harm themselves. The impulsivity that characterizes mania often leads to decisions with serious financial, legal, or relationship consequences. By definition, a manic episode is severe enough to cause major impairment in your work, relationships, or daily functioning, and it sometimes requires hospitalization.
Psychotic Symptoms During Mania
Mania commonly includes psychotic features, meaning delusions or hallucinations that appear only during the episode and resolve once the mood stabilizes. Delusions are more common than hallucinations across all phases of bipolar disorder. Grandiose delusions are especially frequent during mania: a person might believe they are a government operative, a renowned expert in a field they have no training in, or someone with a divine mission. Persecutory delusions, where the person believes they’re being stalked or surveilled, affect roughly a third of people with bipolar disorder during manic episodes.
Auditory hallucinations, particularly hearing voices, are the most common type and can occur in any phase of the illness. Visual hallucinations are less frequent and appear mainly during mania. Other sensory hallucinations (touch, smell, taste) are rare.
How Hypomania Differs From Mania
Hypomania involves the same core symptoms as mania, including elevated mood, increased energy, reduced need for sleep, rapid speech, and impulsive behavior. The key difference is severity. A hypomanic episode is not severe enough to cause marked impairment in your social or occupational life, and it never requires hospitalization. If psychotic features appear at any point, the episode is classified as full mania, not hypomania. Bipolar II disorder is defined by hypomanic episodes (rather than full mania) combined with major depressive episodes.
Symptoms of Bipolar Depression
The depressive side of bipolar disorder often causes more long-term disability than mania. A depressive episode lasts at least two weeks and involves symptoms present nearly every day. The most recognizable are persistent sadness or emptiness, loss of interest or pleasure in activities you normally enjoy, and fatigue or a deep loss of energy that makes even routine tasks feel overwhelming.
Appetite and weight changes go in both directions. Some people lose their appetite and drop weight without trying, while others eat significantly more and gain weight. Sleep is similarly disrupted: you may sleep far more than usual or struggle with insomnia. Psychomotor changes are common too. Some people feel physically slowed down, as if moving through mud (psychomotor retardation), while others feel restless and unable to sit still.
The cognitive and emotional symptoms are often the most painful. Feelings of worthlessness or excessive, inappropriate guilt can become consuming. Concentration and decision-making suffer. In severe episodes, thoughts of death or suicide emerge. Bipolar depression can also include psychotic features, though these tend to be mood-congruent: delusions of guilt, somatic delusions (believing something is physically wrong with your body), or persecutory beliefs.
Mixed Features
Some episodes don’t fit neatly into one pole. A “mixed features” specifier applies when at least three symptoms of the opposite mood pole appear during a manic or depressive episode. For example, you might have the elevated energy and racing thoughts of mania while simultaneously feeling hopeless and suicidal. Mixed episodes are particularly distressing because the high energy of mania combined with the dark mood of depression creates an elevated risk of self-harm. They can also be confusing to experience, since the symptoms seem contradictory.
Cyclothymic Disorder
Cyclothymic disorder is a milder but chronic form of mood cycling. It involves periods of hypomanic symptoms and periods of depressive symptoms that never reach the full severity of a manic or major depressive episode. To meet the diagnostic threshold, these fluctuations must persist for at least two years in adults (one year in children and adolescents), with symptoms present for at least half of that time and no symptom-free stretch lasting longer than two months. Though the individual episodes are less severe, the relentless cycling still impairs daily functioning and quality of life.
Cognitive Symptoms Between Episodes
One of the less recognized aspects of bipolar disorder is that thinking problems don’t fully resolve between mood episodes. Deficits in attention, processing speed, memory, and executive function (planning, organizing, shifting between tasks) persist even during stable periods. These cognitive issues are a major driver of disability. Research shows that memory and executive function problems affect a person’s ability to work and function independently even more than leftover mood symptoms do.
Not everyone is affected equally. Studies suggest that roughly 12% to 40% of people with bipolar disorder have broad cognitive deficits across multiple domains, another 29% to 40% show selective problems mainly in attention and processing speed, and 32% to 48% remain cognitively intact compared to healthy peers. This wide range means cognitive symptoms vary enormously from person to person.
Physical Health Effects
Bipolar disorder isn’t just a mood condition. It carries significant physical health consequences that develop over time. Cardiovascular risk factors, including obesity, high blood pressure, elevated cholesterol, and diabetes, are about twice as common in people with bipolar disorder compared to the general population. These risk factors also tend to appear earlier in life. The result is higher rates of heart attack, stroke, and pulmonary embolism.
Respiratory conditions are also more common. Chronic obstructive pulmonary disease (COPD) occurs at roughly double the rate seen in the general population, and asthma is significantly more prevalent as well. Some data points to increased rates of certain cancers, particularly in the digestive tract, respiratory system, and endocrine glands. Even in adolescents with bipolar disorder, researchers have observed poorer blood vessel function in the brain compared to healthy peers, suggesting that cardiovascular effects begin early.
These physical health problems are partly related to medication side effects and lifestyle factors like smoking, but the disorder itself appears to contribute through inflammation and metabolic changes. Recognizing bipolar disorder as a whole-body condition, not just a psychiatric one, is important for understanding what long-term management involves.