Bloating and pain can be caused by gastrointestinal diseases such as gastritis, urinary system diseases such as cystitis, and gynecological diseases such as inflammation of the uterus. 1. Gastrointestinal diseases: common diseases include gastritis, pancreatitis, cholecystitis, acute enteritis, intussusception, etc., the attack of this type of disease, abdominal pain, abdominal distension and other symptoms often appear. 2. Urological diseases: such as bladder stones, cystitis, bladder tumors, etc. In addition to the symptoms of abdominal distension and abdominal pain in the lower abdomen, this kind of disease can be accompanied by frequent urination, urinary urgency, hematuria, urinary pain and so on. 3. Gynecological diseases: If women have lower abdominal distension and abdominal pain, they should also consider uterine inflammation, uterine space-occupying lesions and other diseases. Causes of abdominal distension and pain are more reasons, such as abdominal discomfort symptoms suggest timely medical treatment, identify the cause of the corresponding treatment, so as not to delay the condition.