Always hiccups may be caused by dietary factors, indigestion, chronic gastritis and so on. 1. Dietary factors: most often seen in too much to eat gas-producing foods, such as sweet potatoes, chestnuts, tofu, etc., will lead to too much gas in the stomach, the gas out of the throat, there will be hiccups sound. 2. Indigestion: When indigestion occurs, the gastrointestinal tract tends to move more slowly, and the food stays in the gastrointestinal tract for a long time, which produces a lot of gas and causes hiccups. 3. Gastritis: patients often have a large amount of gastric acid secretion, the gastric mucosa caused by the stimulation, which can easily lead to stomach spasm contraction, hiccups phenomenon. Always hiccups may also be caused by other reasons, such as central nervous system diseases, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.