The causes of hiccups after drinking milk are mainly related to dietary habits, lactose intolerance, gastroesophageal reflux and so on. 1. Dietary habits: due to drinking milk too fast, milk temperature is too cold, etc. caused by the patient swallowed a lot of gas, gastric mucosa is stimulated, resulting in hiccups. 2. Lactose intolerance: If the milk that the patient drinks contains lactose and the patient is intolerant to lactose, the lactose will ferment in the intestine after drinking milk and produce a lot of gas, which leads to hiccups. 3. Gastroesophageal reflux: due to the relaxation of the lower esophageal sphincter of the patient, when the patient drinks milk, there will be a reflux of gastric contents, which will stimulate the diaphragm, resulting in hiccups. If the patient hiccups after drinking milk, it is recommended to change the habit of drinking milk, if it still can not be improved, it is recommended that the patient go to the hospital in time to complete the relevant examinations, under the guidance of professional physicians to clarify the cause of the disease, and comply with the doctor’s instructions, so as to avoid delays in the condition.