Seasonal affective disorder (SAD) is common in winters months when days are short and nights are long. It is caused by abnormal melatonin metabolism and the patient presents with acute depressive and atypical symptoms.
Here's a mnemonic for atypical symptoms of Seasonal affective disorder.
A- Appetite increase
D- Decreased energy
Note: Treatment of this disorder includes exposure to bright light therapy. Melatonin tablets should not be prescribed in such cases.
- Jaskunwar Singh