You could have a kidney or bladder infection. The only way to get rid of it is to see a doctor. Another possibility is a kidney or bladder stone. The stone forms in the kidney and causes bleeding as it travels down the ureter to the bladder. Once the stone is in the bladder it may not cause bleeding again until it begins to travel down the urethra when one urinates. Both infections and stones can be painful. Infections can be very dangerous if the kidney becomes involved. Similarly a stone trapped in the kidney could disastrously affect the production of urine. Medical attention is important if there is blood in the urine.
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