Stomach pain with black stool can not necessarily be said to be cancer, there are many kinds of diseases can lead to black stool, eating some special food or drugs is also black stool, such as eating animal blood, oral iron-containing drugs, etc.. If microcrystals of the above food or drugs, but there is stomach pain and accompanied by black stools, should consider the possibility of upper gastrointestinal bleeding is more likely. The first thing to consider for peptic bleeding is peptic ulcers, such as gastric ulcers and duodenal ulcers, which not only cause stomach pain but also bleeding, resulting in black colored stools. The second is caused by varices and rupture of esophagogastric fundic veins, which are usually caused by increased portal vein pressure after cirrhosis, and can cause stomach bleeding if you eat hard and rough food. Then there is excessive drinking or taking anti-inflammatory drugs, which can also cause stomach pain and black stools. Finally, there is a tumor in the stomach, such as stomach cancer, which can cause stomach bleeding because the growth process can invade the muscle wall of the stomach. These are the main causes of black stool and stomach pain, so it is not necessarily cancer if the stool is black. If the symptoms of black stool and stomach pain appear, you should go to a tertiary care hospital for relevant examinations to make a clear diagnosis, such as stool routine, gastroscopy, etc., and give regular treatment according to the doctor’s instruction, and cooperate with the doctor during the treatment process.