Left abdominal burning pain did ultrasound no problem may be due to enteritis, ulcerative colitis and other left-sided intestinal diseases. Color ultrasound failed to suggest lesions this is due to abdominal color ultrasound for intestinal examination is not ideal, the intestinal gas is more, color ultrasound for gas interference more organs with lower recognition; for the lesions of the substantive organs have a better degree of recognition. 1. enteritis: the inflammatory reaction that occurs in enteritis can stimulate the intestinal smooth muscle, which can lead to dull pain, colic, burning sensation, etc., which can be paroxysmal or persistent pain; in addition, it can also be accompanied by diarrhea, and the feces can be mushy in nature, and can be watery in severity. 2. Ulcerative colitis: ulcerative colitis due to intestinal mucosal damage and repeated irritation, can be manifested as persistent or repeated episodes of diarrhea, mucus, pus and blood stools, accompanied by abdominal pain, urgency and heaviness (the lower abdomen is uncomfortable, want to relieve stools, after the stools have a sense of incomplete defecation), burning sensation and other symptoms. If symptoms cannot be relieved, early and standardized treatment is recommended to minimize the adverse effects of the disease.