22 Hard-To-Detect Illnesses, From The Commonplace To The Truly Bizarre

3. Colon Cancer

Approximately 50,000 Americans die of colon cancer every year. What makes this affliction extra scary is the symptoms often resemble other ailments. While highly treatable, colon cancer often goes untreated due to the unpleasantness associated with the screenings. Symptoms can include diarrhea, constipation, and blood in your stool, but those only show up after the disease has progressed out of its early stages.