Call your doctor about prostate cancer if:
You have trouble urinating or find that urination is painful or different from normal; your doctor should examine your prostate gland to determine whether it is enlarged, inflamed with an infection, or cancerous.
You have chronic pain in your lower back, pelvis, upper thighbones, or other bones. Pain in these areas can be caused by different things, including the spread of prostate cancer.
You have unexplained weight loss.
You have swelling in your legs.
You have weakness in your legs or difficulty walking, especially if you also have constipation.