Over 20 million people in India suffer from asthma. Airway sensitivity both rural and urban areas has gone up due to many factors. As per a recent study, taking oral vitamin D supplements in addition to standard asthma medication causes a 30% reduction in asthma attacks requiring treatment with steroid tablets or injections, in those with mild-to- moderate asthma. As per the findings, there was a 50% reduction in the risk of people experiencing at least one asthma attack requiring hospitalization or visit to emergency Dept with vitamin D supplementation. Vitamin D is thought to protect against attacks triggered by viral upper respiratory infections by boosting immune responses and dampening down harmful airway inflammation.A chronic lung disease that inflames and narrows the airways, asthma causes recurring episodes of wheezing, chest tightness, shortness of breath and coughing. The coughing often occurs at night or early in the morning. About 15 to 20 million people in India have asthma, and some studies even put this number at 30 million.