The first thing to consider is whether the black color of the stool is related to the food you have consumed. For example, if you have recently consumed pig’s blood, sheep’s blood, duck’s blood, pig’s liver, etc., it can cause black stools. Secondly, have you recently taken any medications, such as bismuth aluminate granules, bismuth pectin, iron dextrose, etc.? These can cause black stools, which is a normal reaction after taking medication and does not require special treatment. If the patient’s stool is black and accompanied by dizziness, fatigue and other discomforts, it is recommended to go to the hospital in a timely manner, except for the possibility of gastrointestinal bleeding. You can first improve the blood routine, fecal routine to see whether there are signs of bleeding, to assess the amount of bleeding, and then it is best to improve the gastroenteroscopy to find out the location of the bleeding and the amount of bleeding, to assess the condition of the common diseases are esophagogastric fundal varices, peptic ulcer, gastric cancer, colon cancer, gastric mesenchymal stromal tumors, etc., in this case, it is best to need to be hospitalized and systematic treatment.