Hiccups can be caused by a number of things: rapid eating, carbonated beverages, alcohol, dry breads, some spicy foods, and laughing. Intractable hiccups (severe and persistent hiccups) may be caused by a number of diseases and conditions including electrolyte imbalance.
Physically, hiccups are caused by involuntary contractions of your diaphragm.
Hiccups are caused by involuntary contractions of the diaphragm muscle. They can be triggered by various factors such as eating too quickly, consuming Carbonated Beverages, or sudden changes in temperature. Typically, hiccups go away on their own, but holding your breath, sipping cold water, or breathing into a paper bag can help alleviate them.