Gastroenterologists are doctors trained to diagnose and treat diseases of gastrointestinal tract and liver. A gastroenterologist deals with health concerns related to esophagus, stomach pain, intestines, pancreas, gallbladder, bile ducts, colon, rectum, and liver. If you are suffering from trouble swallowing, heartburn, food reflux after swallowing and recurrent diarrhea you should find and consult the best gastroenterologist in Karachi for correct diagnosis and proper treatment. A gastroenterologist has tools and expertise to diagnose and treat Crohn's disease, ulcerative colitis, all types of hepatitis, cancer of the esophagus and colon polyps that can transform into cancer.