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I am a cancer doctor
cancer can cause weight loss, but other issues can cause weight loss as well such as hyperthyroidism, bowel inflammation which can cause poor nutrition absorption, chronic illness can cause weight loss
prostate cancer can often have very little to no symptoms.
there is a flawed screening test of blood PSA levels and finger rectal prostate physical exam which trieds to detect prostate cancer early.
why do you think you may have prostate cancer?
you should have a CT scan of your body to see why you may be loosing weight, even at 90 years old.
if you don't know what you have inside of your body, there is no way to know if it is curable or not.