Hemophilia refers to a group of inherited disorders that cause abnormal bleeding. The bleeding occurs because part of the blood -- called plasma -- has too little of a protein that helps blood clot.
Symptoms of hemophilia range from increased bleeding after trauma, injury, or surgery to sudden bleeding with no apparent cause. There are two types of hemophilia:
Hemophilia A -- also called classic hemophilia -- is most common and occurs in about 80% of people with hemophilia.
A healthy person usually has a platelet count of 150,000 to 400,000. You have thrombocytopenia if your number falls under 150,000.
If you're wondering what the long name means, here's how it breaks down: "thrombocytes" are your platelets and "penia" means you don't have enough of something. Put those terms together, and you get "thrombocytopenia."
Thrombocytopenia happens when your body makes too few platelets, or the platelets you have are trapped in the spleen, or they are destroyed.
It can run in families. But you can also get it from many medical conditions and some drugs.
If your spleen is enlarged, that can trap platelets, and they won't move through your body.
Sometimes your immune system, which is supposed to fight off disease, attacks healthy cells. When it attacks your platelets, that's called idiopathic thrombocytopenic purpura (ITP).
In other cases, your body just uses too many platelets, leaving you without enough of them. That can happen if you have an autoimmune disease, like rheumatoid arthritis or lupus. The same is true if you have thrombotic thrombocytopenic purpura (TTP), which uses a lot of platelets to make small blood clots throughout your body.
Your blood platelets can also be destroyed because of: