A disorder associated with episodes of mood swings ranging from depressive lows to manic highs.
The exact cause of bipolar disorder isn’t known, but a combination of genetics, environment, and altered brain structure and chemistry may play a role. Manic episodes may include symptoms such as high energy, reduced need for sleep, and loss of touch with reality. Depressive episodes may include symptoms such as low energy, low motivation, and loss of interest in daily activities. Mood episodes last days to months at a time and may also be associated with suicidal thoughts. Treatment is usually lifelong and often involves a combination of medications and psychotherapy.

Bipolar Disorder: What does it feel like? Bipolar disorder is an illness that produces dramatic swings in mood (amongst other symptoms). A person with bipolar disorder will alternate between periods of mania (elevated mood) and periods of depression (feelings of intense sadness).

Symptoms that are common in both men and women include:
high or irritated mood.
more energy and greater goal-driven activity.
elevated self-esteem or grandiosity.
reduced sleep.
higher than usual frequency of talking.
rapid speech flow and flights of ideas or racing thoughts.
being easily distracted.