Prostate cancer is a common disease that can attack men of all ages and affects the prostate, which is a gland located below the bladder. In early cases of the disease, the symptoms are usually unnoticeable, but as the disease progresses symptoms may arise and cause discomfort. Symptoms of prostate cancer include (to learn more about each symptom, click on the link): 1. Erectile dysfunction: While in the early stages, the symptoms are often unnoticed, but as the disease progresses patients experience symptoms like urination problems, pain, weakness or numbness in the limbs, and erectile dysfunction. Find out more about erectile dysfunction and side effects of prostate cancer treatments.