Esophagus diseases:–  Swallowing with difficulty,  Stiff neck,  Gastro-esophageal reflux disease (GERD) etc., Stomach diseases, e.g.-  Gastritis,  Peptic ulcer,  Stomach cancer, etc.   –Biliary tract diseases, e.g.-  Gallstone,  Cholecystitis,  Ascending cholangitis,  Biliary atresia, etc.- Liver diseases, e.g.-  Hepatitis,  Hepatitis A, B and C ,  Alcoholic hepatitis,  Toxic hepatitis,  Autoimmune hepatitis,  Fatty liver, or hepatic steatosis,  Cirrhosis,  Liver cancer, etc.-   Intestine diseases, e.g.-  Excretion disorders,  Enterocolitis,  Dysentery,  Ulcerative colitis,  Irritable bowel syndrome,  Colon cancer, etc.