If you're seeing a doctor for IBS, track your symptoms in the weeks leading up to the appointment. Tell your doctor when the symptoms started, how long they've been going on, and whether certain foods or drinks are making the issues better or worse. You'll also need to tell your doctor if there are any warning signs of disease other than the IBS. Be sure to note if you have blood in your stool, unintentional weight loss, nausea, vomiting, or uncontrollable diarrhea because those can indicate more serious problems.