Hemophilia A is an inherited blood disorder where the blood does not clot normally due to a lack of clotting factor VIII. Symptoms include spontaneous bleeding, bruising, joint pain and swelling, and internal bleeding. The disease is passed down from mothers to sons on the X chromosome. Treatment involves replacing the missing clotting factor through intravenous injections or nasal spray medication. There is no cure for hemophilia, but genetic counseling can help determine risk for children.