31/f. Digestive issues last 5 yrs. Ate chowder, diarrhea & gas for 3 days. Improving, saw mucus, maybe blood? No fam history of cancer. What'll dr do?

History. Your doctor will likely get a more detailed history from you and ascertain whether you are lactose-intolerant (chowder->gas & diarrhea) and check on other possibilities. Since you have not given any details on what kind of digestive problem and for how long, it is impossible to provide a guess. Stay away from milk or ice cream for now.