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Yes, certain mental illnesses, such as depression and Bipolar disorder, may have a seasonal component. Seasonal affective disorder (SAD), a form of depression that typically begins in fall and remits in spring, may be triggered by reduced exposure to sunlight during the winter months. Studies indicate the physiological basis for SAD may lie in the brain's pineal gland, which secretes melatonin, a hormone responsible for regulating the body's circadian rhythms (changes in the body's biological functions, including the sleep-wake cycle, that occur over a 24-hour period).

Some people with major depression and bipolar disorder follow a pattern similar to those with SAD; however, a subgroup of patients demonstrate an atypical cycle with depression increasing in summer, and manic episodes (if applicable) peaking in fall and winter.

Most mental disorders are not significantly effected by changes in season. Anxiety disorders, for example, may be continuous, or may wax and wane according to other variables, such as stress.

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