A four-year-old child’s constant nausea may be related to hepatitis, chronic pharyngitis and gastric insufficiency. 1. Hepatitis: Hepatitis B, for example, causes damage to liver cells, and many digestive enzymes are synthesized by the liver, so hepatitis patients may have nausea. 2. Chronic pharyngitis: When children have had acute pharyngitis that was not treated in time or was not cured, it became chronic pharyngitis. Inflammation leads to burning or dryness in the pharynx and foreign body sensation in the pharynx, causing nausea. 3. Gastric insufficiency: Acute gastric dilatation, gastrointestinal insufficiency and indigestion due to eating too fast, too much or too greasy food. It will slow down gastric emptying, thus causing dry heaving. Four-year-old children are always nauseous, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.