Vomiting brown discharge in the morning needs to be alerted as a result of reflux gastritis, cholecystitis, gastric ulcer and other diseases. Reflux gastritis is a disease caused by excessive secretion of gastric acid, which causes irritation to the gastric mucosa. When you wake up in the morning, nausea and vomiting are caused by stomach acid irritating the mucous membrane of the stomach, and when you vomit, undigested food is excreted from the stomach, resulting in a brown color. Some people may suffer from gallbladder attacks due to blockage of bile excretion, which can affect the bile excretion function of the patient during the attack. The attack is triggered especially after eating high-fat food before going to bed. When vomiting, the digested food is vomited out of the stomach, so the color of vomit will be brown. In severe cases of gastric ulcers, the ulcer surface may bleed and the color of the blood may change to brown when it is broken down by stomach acid in the stomach. When vomiting occurs, it will also show a brownish discharge.