The exact causes of bipolar disorder, which is also called manic depression, is still not confirmed. It could have to do with brain structure – the pathways or circuits – that control mood, behavior, and thinking or it could be brain chemistry. It is likely genetic, since it often runs in families. Anyone can get bipolar disorder at any age, but most people show symptoms before the age of 25.
Bipolar disorder is generally known for two opposite phases: depression and mania. During a depressed period, you may feel sad, hopeless, and worthless. You might even think about suicide.