When you have the rare but treatable disorder known as aplastic anemia, your marrow -- the spongy stuff inside your bones -- stops making new blood cells. Sometimes it stops making just one type, but more often you become low on all three: red and white cells, and platelets.
It can develop slowly or come on suddenly. If your blood count gets low enough, it can be life-threatening.
There are different types of hemophilia. With hemophilia A, your body doesn’t have enough of a protein called factor VIII, which your body needs to make clots and stop bleeding.
Hemophilia A can be mild, moderate, or severe, depending on how little you have of factor VIII.
Hemophilia A runs in families. It's usually diagnosed in babies, toddlers, or young children.
Hemophilia A comes from your genes. You can inherit it from your parents. Or it can happen if a certain gene changes before you're born. This change is called a mutation.
There is a rare, dangerous form of hemophilia A that is not inherited. It's called acquired hemophilia A and it can be related to pregnancy, cancer, or the use of certain medications. However, no cause can be found in about half of cases.
The main symptoms you might notice are bleeding more than normal and bruising easily. For instance: