Depression can make a person feel unusually sad, worthless, uninterested in activities that used to be fun, restless or even suicidal.

Depression is a serious illness that requires professional treatment, often with a combination of medication and psychological therapy.

The American Academy of Family Physicians offers these suggestions for dealing with depression:

Set a realistic schedule for yourself. While you're getting better, don't expect that you can maintain a full schedule at a regular pace.

Try not to believe the negative thoughts, like feelings of failure, that depression causes -- such thoughts should ease as depression subsides.

Participate in activities that make you feel good about yourself and that you enjoy.

While you're depressed, try to avoid making any major life decisions. If you have to, ask a trusted friend or family member for help.

Don't drink alcohol or take unprescribed drugs, as either can cause serious interactions with antidepressant medication, and can exacerbate depression.

Get as much exercise as possible -- at least 30 minutes four to six times a week.