Purple color of vomit may be caused by upper gastrointestinal bleeding, cholecystitis or intake of large amount of purple food. 1. Upper gastrointestinal bleeding: The purple color of blood will appear when vomiting due to the fact that blood accumulates in the stomach for too long, causing it to turn into a purple-brown substance under the action of stomach acid. Common upper gastrointestinal bleeding diseases include esophagitis, gastric ulcer, duodenal ulcer, etc. Once this situation occurs, you should actively go to the hospital for gastroscopy and use medication as prescribed by the doctor. 2. cholecystitis: normal gallbladder bile color is darker, dark brown, if you suffer from acute cholecystitis, vomiting purple-brown blood may be gallbladder bile, this time you should go to the hospital in time to find out the cause of the disease and active treatment. 3. Purple food intake: when more purple food intake, and food into the stomach can not be digested, the purple pigment in the food and stomach acid mixed with the vomit discharge, may also be mistaken for vomiting purple blood. If the patient vomits purple blood, you should actively consult a doctor to determine the cause of the disease and follow the doctor’s instructions to standardize the treatment, so as to avoid delaying the condition.