Nausea after eating bananas may be caused by indigestion, chronic gastritis, peptic ulcer, acute gastroenteritis and other reasons. 1. Indigestion: gastric power is insufficient, eating too many bananas increases the burden on the stomach, which can’t be digested and emptied in time, causing abdominal distension, nausea, abdominal pain and other symptoms. 2. Chronic gastritis: Inflammation and erosion of gastric mucous membrane damage, after eating bananas stimulate increased secretion of gastric acid, causing stomach pain, nausea, bloating and so on. 3. Peptic ulcer: the gastric mucosa has an ulcerated surface, the digestion and absorption ability is weak, after eating bananas lead to an increase in gastric acid secretion, stimulate the ulcerated surface to cause nausea, acid reflux, heartburn, abdominal distension, stomach pain and other symptoms. 4. Acute gastroenteritis: bananas are spoiled, causing acute gastroenteritis after eating, resulting in nausea, abdominal pain, diarrhea and other symptoms. Nausea after eating bananas, it is recommended to consult a doctor in a timely manner to identify the cause of the disease and follow the doctor’s instructions for treatment.