Hiccups are caused by spasmodic contraction of the diaphragm, increased pressure in the thoracic cavity, and rapid entry of air into the lungs, passing through the vocal cords. There are physiological reasons such as diet and pathological reasons such as indigestion. 1. Physiological causes: In daily life, if you often drink cold drinks, or do not pay attention to keep warm in cold weather, inhale too much cold air inadvertently, and eat too much food, it may cause the diaphragm to spasmodic contraction, the pressure in the thoracic cavity increases, resulting in hiccups. 2. Pathological causes: indigestion, esophagitis and other digestive diseases, meningitis, cerebrovascular accidents and other neurological diseases, as well as pericarditis, pleurisy and other cardiothoracic diseases, may cause spasmodic contraction of the diaphragm, which may cause hiccups. Hiccups may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or therapy.