Seasonal Affective Disorder (SAD) is a type of depression caused that is initiated by seasons of the year. Experts consider two specific chemicals, melatonin and serotonin, may be involved in SAD. Those two entities contribute to regulate a person’s energy, mood and regular life style. There are two common types of SAD: Winter-onset depression and Summer-onset depression. Winter-onset starts in late fall or early winter and passes by summer. Summer-onset depression normally begins in late spring or early summer and passes by winter. SAD may be influenced by the amount of daylight during different times of year.
Shorter days in fall and winter may cause increased melatonin and decreased serotonin, creating favorable conditions for SAD. Symptoms are not persistent at the same time of each year. Most of the people suffering from SAD feel the first symptoms in beginning of September or October and end in April or may.
Winter-onset seasonal affective disorder symptoms include:
Summer-onset seasonal affective disorder symptoms include:
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