###Human: I have moderate abdominal pain on left side with white balls in stools. What is my problem? ###Assistant: Hello. Yes, you might be having IBS (irritable bowel syndrome) and you might have developed small intestinal bacterial overgrowth (SIBO), with IBS which can occur commonly. In SIBO you get fat malabsorption which can lead to white stools. Can you please tell me whether you get greasy stools and bloating or not? Let me tell you that greasy stools are identified by a foul smell and floating on top of commode water. Also, share how much weight have you lost in how much time? I will start you on the treatment of SIBO, but meanwhile, we have to investigate and rule out other diagnoses whenever feasible for you. SIBO. CBC (complete blood count). C-reactive protein. TSH (thyroid-stimulating hormone). Stool routine, examination, and culture. Stool for fat content. Stool for reducing substances. Colonoscopy or Sigmoidoscopy if needed in the future. Pseudomembranous colitis. Tablet Rifaximine 550 mg thrice a day for 14 days, Mebeverine thrice a day. Oral rehydration solution. Exercise. After two weeks.