Why do I feel worse in winter?

Answered by Dr. Nitnem Singh Sodhi · Mental Health Counsellor, Neuropsychologist & Psychotherapist · Updated 2026-06-30

Short answer

SAD is driven by less daylight, not cold. It is under-recognised in India because we assume 'sunny country = no SAD,' but shorter days and smog-blocked sunlight in north Indian winters produce classic symptoms in a real subset of people.

Seasonal Affective Disorder is a subtype of depression that follows a predictable pattern — same time each year, usually autumn/winter, remitting in spring. It is driven mainly by reduced light reaching the retina, which affects melatonin, serotonin and circadian rhythm.

Why it happens in India too

In north India, December–January daylight is short and often filtered through heavy smog. In students and IT workers who leave home before dawn and return after dark, effective light exposure can be near zero for weeks. That is enough to trigger SAD in genetically susceptible people, regardless of ambient temperature.

What works

20–30 minutes of bright morning outdoor light — go for a walk between 7–9am, no sunglasses. If genuine outdoor light is not possible, a 10,000-lux light therapy box for 20–30 minutes in the morning is evidence-based. Vitamin D testing (India has near-universal deficiency), regular exercise, and if symptoms meet PHQ-9 depression threshold, standard antidepressant treatment works.

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