It's normal to have some days when you feel down. They may also experience depression during the fall and winter months. For example, spring and summer can bring on symptoms of mania or a less intense form of mania (hypomania), anxiety, agitation and irritability. In some people with bipolar disorder, episodes of mania may be linked to a specific season. People who have bipolar disorder are at increased risk of seasonal affective disorder. Symptoms specific to summer-onset seasonal affective disorder, sometimes called summer depression, may include:

Appetite changes, especially a craving for foods high in carbohydrates.Symptoms specific to winter-onset SAD, sometimes called winter depression, may include:

Experiencing carbohydrate cravings, overeating and weight gain.Losing interest in activities you once enjoyed.Feeling listless, sad or down most of the day, nearly every day.In either case, symptoms may start out mild and become more severe as the season progresses. Less commonly, people with the opposite pattern have symptoms that begin in spring or summer. In most cases, seasonal affective disorder symptoms appear during late fall or early winter and go away during the sunnier days of spring and summer.

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