Eating some meals will not hurt not to consider the sigmoiditis, may be duodenal ulcer. Typical symptoms of duodenal ulcer is abdominal pain, usually accompanied by acid reflux, heartburn, nausea, loss of appetite, bloating and other symptoms. Sigmoiditis usually presents with abdominal pain, diarrhea, nausea, vomiting, and loss of appetite, and the pain is usually not relieved by eating a meal. Both duodenal ulcers and sigmoiditis cause pain in the left side of the abdomen, sigmoiditis in the lower left side, and duodenal ulcers usually in the upper left side. Some of the symptoms are similar between the two, and patients are unable to accurately determine which disease it is. It is recommended that patients go to the hospital to do gastroscopy and other related tests to clarify the cause of the disease, and follow the doctor’s instructions for treatment, so as not to delay the condition.