Blood in the urine (hematuria). While this is a
common condition for people who have hemophilia, it usually is not dangerous
when it is treated appropriately. Blood clots that form in the
urethra can cause sharp pain in the lower part of the
belly because urine flow out of the bladder is blocked.
the digestive system, most often noticed in vomit or in the stool. Blood in the
digestive system may sometimes cause vomit that looks like coffee grounds or
give a black and tarry appearance to the stool. If enough blood is lost, you
might have symptoms of
anemia, such as lightheadedness, weakness, and
Bleeding inside the head (intracranial hemorrhage). Often
a result of a head injury, this is very dangerous because it may cause brain
damage and death.
Compartment syndrome, a rare complication that
develops when bleeding in the muscle puts pressure on arteries and nerves
inside the muscle. This syndrome can cause serious damage to the
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