Factor XII Deficiency is a hereditary blood clotting disorder that affects only a small percentage of the population. Also referred to as Hageman factor deficiency, it is a rare condition that can lead to excessive bleeding and bruising. This disorder is caused by a deficiency in Factor XII, a protein that plays a vital role in blood clotting. Some synonyms for Factor XII Deficiency include Hageman factor deficiency, FXII Deficiency, coagulation factor XII deficiency, and Factor XII insufficiency. While this condition may be rare, it is important for those affected to receive proper medical care to manage symptoms and prevent complications.