Left abdominal pressure pain, not press no pain, often fart, may be constipation, irritable bowel syndrome, etc., the patient should promptly seek medical attention to clarify the cause of the disease. 1. constipation: left abdominal pressure pain, not press the pain often farting may be bad bowel habits, hemorrhoids and other factors caused by constipation, the patient will also have a decrease in the number of bowel movements, left abdominal pressure pain, not press the pain, often farting and other symptoms. 2. Irritable bowel syndrome: left abdominal pressure pain, do not press not pain, often farting may also be caused by mental stress caused by irritable bowel syndrome, mostly in the 20 to 50 years of age of the white-collar population, such patients are negative, there will be constipation or diarrhea, which should pay attention to maintain a happy mood. Patients should improve bad habits, if necessary, can be treated under the guidance of a doctor.