The causes of nausea and hiccups are: i. Pathological. Nausea and hiccups occur in some gastrointestinal tract diseases because of reduced digestive function and inability to digest the ingested food. Second, physiological. 1. Eating too much indigestible proteins and fats, especially greasy foods, which add burden to the gastrointestinal tract and cannot be digested and decomposed in time, resulting in hiccups and nausea. 2. Ingesting carbonated beverages or soy, foods that easily produce gas, resulting in hiccups. 3. It is seen in early pregnancy reactions in the early stages of pregnancy, and in late pregnancy when the uterus moves up and tops the stomach, which affects the digestive function of the stomach.