Many think of it as 'sticking.' implantation in humans always occurs when the embryo is between 6-7 days old. A very popular concept on the internet now in 2012, 'implantation bleeding, ' is speculative and mostly not useful.
Also, urinary stones can form in the bladder lining due to an accumulation of debris and chemicals. Broken blood vessels can cause blood in the urine, often because of torn or enlarged veins on the inner surface of the prostate. Blood in the urine also can be caused by the sudden stretching of the bladder wall.
Mayo Clinic in Minnesota has been recognized as the best Urology hospital in the nation for 2016-2017 by U.S. News & World Report. Prostate gland enlargement is a common condition as men get older. Also called benign prostatic hyperplasia (BPH), prostate gland enlargement can cause bothersome urinary symptoms. Untreated, prostate gland enlargement can block the flow of urine out of the bladder and cause bladder, urinary tract or kidney problems.