Like diabetes and heart disease, bipolar disorder is a real medical condition, and like both of these illnesses, it can be treated effectively.

Bipolar disorder is also known as manic-depressive illness. It causes dramatic mood swings—from "high" feelings of extreme euphoria or irritability (mania) to hopelessness (depression). Each episode of mania or depression changes a person's energy level, thought process, and behavior, and can last for hours, weeks, or several months. This disease can damage relationships, can cause problems with school and work, and can even lead to suicide.

The good news is, treatment can help. This section will provide you with a solid understanding of bipolar disorder—what it is, what causes it, and how it can be treated.