You can drink lemon water when you have a cold, but you should avoid drinking it in large quantities or on an empty stomach. Drinking lemon water in moderation when you have a cold can replenish the water and vitamin C and other nutrients needed by the body, which is conducive to the recovery of cold patients. However, lemon water contains more acidic substances, if you drink it on an empty stomach or in large quantities, it is easy to stimulate the gastric mucosa, and also induce excessive secretion of gastric acid, which will cause some stimulation of the mucous membrane of the stomach wall, further damaging the health of patients with colds. Patients usually have decreased immunity and weakened gastrointestinal function when they have a cold, so their diet should be based on light, easy-to-digest food, and they can appropriately increase the intake of fresh vegetables and fruits, avoiding oily, spicy, stimulating and cold foods. Cold and flu symptoms should be sought medical treatment, so that the doctor to give treatment; at the same time, patients need to pay attention to rest, sleep, and moderate exercise, conducive to the recovery of the body.