Q. “I am suffering from a disease in which blood often comes out of my throat. When I fast, does this bleeding or vomitting render my fast for wudu invalid?”
A. No, if the blood has come out of your throat and you have not swallowed it again, your fast is still valid. However, your wudu is no longer valid. You will have to perform it again, if you wish to perform prayer after it. The same ruling applies when one vomits during fasting. One’s wudu breaks, but does not render his fast invalid.