Seasonal affective disorder (SAD), additionally referred to as winter depression, winter blues, summer depression, season unhappiness, or seasonal depression, could be a mood disorder set during which people that have traditional mental state throughout most of the year expertise depressive symptoms within the winter or summer.
SAD becomes depressed in the winter, because of a phase delay in circadiacrhythms relative to the sleep/wake cycle. Seasonal mood symptoms suggest that genetic aberrations may underlie the various abnormalities, which cause SAD symptoms. Melatonin secretion occurs later in the night, Feel 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.
The prevalence of SAD and S-SAD were estimated at 6.8% to 9.8%, respectively, which is signifi- cantly lower than prevalence rates obtained with the same method . The standardized rate ratios compared with other states were 3.49 and 4.63 for SAD.