If the blood vessels in the bowel and the kidneys get inflamed, HSP can make you bleed when you have a bowel movement or when you urinate. Serious kidney problems don't happen very often, but they can occur. This makes a blockage in your intestines that may need surgery. Fortunately, HSP usually gets better without any treatment. Sometimes medicines like prednisone can help people with severe stomach pain.
Most people do fine.
Usually, HSP gets better on its own and doesn't cause lasting problems. About half of people who had HSP once will get it again. Your doctor may want to check urine samples several times after your HSP goes away to check for kidney problems. Be sure to see your doctor as many times as he or she tells you to. This handout provides a general overview on this topic and may not apply to everyone.