Multiple physical symptoms (such as heaviness of head, vague body aches) are paicularly common in the elderly depressives and depressed patients from the developing countries (such as India) * MC psychiatric disorder in India: Depression * Neurotransmitter involved: Serotonin and nor-epinephrine * MC cause of suicide: DepressionRisk features of suicide in depression: * Endogenous type of depression * Psychotic depression * MC type of post-puerperal psychosis: Depression * Nihilistic ideas: Seen in depression