Upper left abdominal pain with irregular stools may be related to irregular or unclean diet, acute or chronic enteritis, intestinal tumors and other causes. 1. Irregular or unclean diet: it usually leads to intestinal infections and symptoms of abdominal pain and unformed stool. At the same time, it may also lead to diarrhea, fever, etc. In severe cases, even water, electrolyte, acid-base balance disorders. At this time, we need to actively carry out anti-infection, anti-diarrhea, rehydration and other treatments. 2. Acute and chronic enteritis: when inflammation occurs in the intestines, it will reduce the ability of intestinal digestion and absorption, and the symptom of unshaped stools will occur. At the same time, the inflammation stimulates the nerves of the intestinal wall, resulting in pain symptoms. 3. Intestinal tumor: such as colon cancer, rectal cancer, etc., will cause intestinal dysfunction and change of bowel habit. As a result, symptoms such as unshaped stool, black stool and blood in stool will appear. At the same time, the intestinal mass stimulates the nerves of the intestinal wall, resulting in pain symptoms. It is recommended to eat a regular diet, do not eat spicy and stimulating food, do not smoke and drink, rest on time, regular work and rest. It is recommended to go to the regular hospital for colonoscopy and other examinations to clarify the diagnosis and treat the cause.