Seasonal affective disorder (SAD), also known as winter depression, winter blues, summer depression, summertime sadness, or seasonal depression, is a mood disorder subset in which people who has normal mental health throughout most of the year experience depressive symptoms in the winter or summer.
Seasonal mood symptoms suggest that genetic aberrations may underlie the various abnormalities, which cause SAD symptoms are Feeling sad, grumpy, moody, or anxious, Lose interest in your usual activities, Eat more and crave carbohydrates, such as bread and pasta, Gain weight, Sleep more but still feel tired, Have trouble concentrating. Medication of drug Melatonin secretion occurs later in the night.
We describe 254 patients with SAD; most of them had a bipolar affective disorder, especially bipolar II, and their depressions were generally characterized by hypersomnia, overeating, and carbohydrate craving and seemed to respond to changes in climate and latitude. The positive correlation between latitude and prevalence of winter SAD applied predominantly to the age groups over 35-60.