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

9. Coronary Artery Disease

Coronary artery disease occurs when the arteries supplying blood to your heart narrow and limit the heart’s blood supply. However, the symptoms of the disease are often dismissed due to the multiple other ailments that also lead to chest pain. The scariest part: in many cases, the first noticeable symptom of the disease is a heart attack.