Symptoms.The large size of the adult worms also presents problems, especially if the worms physically block the gastrointestinal tract.Ascaris have migrated into and blocked the bile or pancreatic duct or the worms have penetrated the small intestine resulting in acute (and fatal) peritonitis.Headaches, abdominal pains, loss of appetites, vomiting, diarrhea, and irritability are the common symptoms of intoxication caused by adult worms