Vitamin D Deficit and Seasonal Stress: Late Winter Sees Surge in Health Complaints

The end of winter turns into a peak period of health complaints for many people — including colds, seasonal flare-ups, and emotional burnout. According to an analysis of social media posts conducted by Sidorin Lab and Win2Win Communications, 34% of messages mention fever, cough, and flu; 29% refer to allergies and chronic conditions; and 20% concern depression, anxiety, and exhaustion. This seasonal phenomenon reflects a biochemical deficit of vitamin D and serotonin, compounded by anthropological adaptation to prolonged darkness. Office Stress and Tinnitus Fever is mentioned in 20.3% of posts, cough in 7.0%, flu in 5.7%, a runny nose and common cold in 4.0% each, and acute respiratory viral infections (ARVI) in 2.3%. Allergies dominate among chronic conditions at 16.2%, followed by exacerbations at 3.3%.