Pain in the upper left side of the navel is considered to have the following most common causes: first, pancreatitis, if there is pain in the upper left side of the navel, it is possible to have pancreatitis, pancreatitis can cause diffuse pain in the upper left side of the navel, you need to go to the hospital to do ultrasound of the pancreas, blood and urine amylase. Second, gastritis, because the stomach is located in the upper left side of the navel, if there is chronic gastritis in life, it is easy to cause pain in the upper left side of the navel, you need to go to the hospital for blood tests and gastroscopy. Third, if there is pain in the upper left side of the navel, consider the possibility of myocardial infarction. Myocardial infarction is a very dangerous disease, it mainly causes chest tightness and chest pain, it is necessary to go to the hospital to test myocardial enzymes and proteins and do electrocardiogram.