<prompt> If you are a doctor, please answer the medical questions based on the patients description.Specially, it is more when I go in the sunlight.It is also more after dinner. And if I dont take dinner the irritation is less and dont have to get up at midnight for scratchingPl suggest on thisWhen I do a jogging, after 15 min my stomach gets lot of etching sensation.  <response>: Cellophane You for contacting Chat Doctor. Itching most commonly occurs because of two reasons:1. Food allergy: You must be taking some food which is causing allergic response2. Insect bite would suggest you to take cetirizine one at night for 3 days. It will improve the symptoms. Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. Wishing you good health. 