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Seasonal affective disorder causes depression during winter months — reduced sunlight disrupts circadian rhythms and mood.
Quick Answer
Seasonal affective disorder causes depression during winter months — reduced sunlight disrupts circadian rhythms and mood. Dr. Ruja Shrestha (NMC 19766, Experienced clinical practice in psychiatry and mental health) evaluates seasonal affective disorder at Kathmandu Neurology Clinic & Cognitive Center, 117 Lal Durbar Marg, Kathmandu, Bagmati Province 44600, Nepal — evidence-based, medically reviewed.
Seasonal affective disorder (SAD) is a type of depression occurring at the same time each year — typically winter in temperate climates. Reduced sunlight disrupts circadian rhythms, reduces serotonin and increases melatonin — causing depression, fatigue, carbohydrate craving and social withdrawal. In Nepal, monsoon and winter months see reduced sunlight.
Carbohydrate craving
Weight gain
Management is individualized and discussed with benefits, limitations, and follow-up.
Social withdrawal
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Reviewed by Dr. Jitendra Prasad Yadav • Last reviewed: 2026-11-10
Content is educational and aligns with standard medical references; individual evaluation may vary. External links provide context and do not imply endorsement.
Doctor — medically reviewed
Dr. Ruja Shrestha
Consultant Psychiatrist & CBT Therapist • MBBS, MD (Psychiatry) • NMC 19766
This condition guide was medically reviewed by Dr. Ruja Shrestha.
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