Bloating and pain in the left abdomen are caused by dietary factors and disease factors. If the flatulence hurts a lot or the flatulence does not ease for a long time, you need to go to the gastroenterology department of the hospital for consultation to identify the cause and treatment. 1, dietary factors: If you consume too much gas-prone food, it can lead to flatulence, such as soy products, sweet potatoes, etc. These foods can ferment in the gastrointestinal tract to produce a lot of gas, causing abdominal flatulence. Generally reduce the intake of gas-producing food can be alleviated, and should also adjust the diet structure, appropriate exercise to speed up the gastrointestinal tract peristalsis; 2, disease factors: mostly related to intestinal tuberculosis, constipation, ulcerative colitis and other diseases. People with constipation will have a bloated feeling on the left side of the stomach because the stool stays in the intestine for too long, mainly stopping in the sigmoid colon and rectum in the lower left abdomen, so they can be regulated by diet and given laxative drugs such as lactulose if the symptoms are severe. With ulcerative colitis will affect the function of the colon, there will also be a feeling of bloating, some people are mainly on the left side, you can give drugs such as mesalazine and dexamethasone.