Bipolar disorders are brain disorders that cause changes in a person’s mood, energy and ability to function. Bipolar disorder is a category that includes three different conditions — bipolar I, bipolar II and cyclothymic disorder.

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Depression is a mood disorder that causes a persistent feeling of sadness and loss of interest. Also called major depressive disorder or clinical depression, it affects how you feel, think and behave and can lead to a variety of emotional and physical problems.

Disruptive mood dysregulation disorder (DMDD) is a condition in which children or adolescents experience ongoing irritability, anger, and frequent, intense temper outbursts. The symptoms of DMDD go beyond a “bad mood.” DMDD symptoms are severe.

Seasonal affective disorder (SAD) is a type of depression. It happens during certain seasons of the year, most often fall or winter. It is thought that shorter days and less daylight may set off a chemical change in the brain leading to symptoms of depression.

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Premenstrual dysphoric disorder (PMDD) is a much more severe form of premenstrual syndrome (PMS). It may affect people of childbearing age. It’s a severe and chronic health condition that needs attention and treatment. Lifestyle changes and sometimes medicines can help manage symptoms.

Persistent depressive disorder is a continuous, long-term form of depression. You may feel sad and empty, lose interest in daily activities and have trouble getting things done. You may also have low self-esteem, feel like a failure and feel hopeless.

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Substance/medication-induced mood disorder is a mental health condition characterized by significant and persistent disturbances in mood, emotions, or behavior such as those seen in depression and bipolar disorders resulting from the use, abuse, or withdrawal of substances or medications.