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Depression

A person who is in a bipolar depressive state is going to look just like someone who has regular depression. "They have the same problems with energy, appetite, sleep, and focus as others who have 'plain old depression,'" Dr. Malone says.

Unfortunately, typical antidepressants alone don't work well in patients who are bipolar. They can even make people cycle more frequently, worsening their condition, or send someone into a break-with-reality episode.

"Antidepressants can be downright dangerous in people with bipolar because they can send them into mania," he says.

Next: Irritability