Chronic erosive gastritis and allergic rhinitis generally do not cause increased blood leukocytes. 1. Chronic erosive gastritis: it is mostly caused by bad dietary habits, smoking, drinking alcohol, abuse of antibiotics, etc., which stimulates excessive secretion of gastric acid and damages the mucous membrane of the stomach, and does not usually cause leukocyte elevation; acute erosive gastritis can cause leukocyte elevation symptoms. 2. Allergic rhinitis: it is a kind of non-infectious rhinitis caused by allergens, which belongs to allergic reaction, and will appear sneezing, running nose, itchy nose, nasal congestion and other symptoms, which generally does not cause leukocyte elevation. If symptoms of elevated white blood cells occur, it indicates an inflammatory infection. Chronic erosive gastritis, allergic rhinitis, need to go to the hospital in time for examination, clear cause of the disease, and then follow the doctor’s instructions for targeted treatment.