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There are very low levels of clotting factors and sudden bleeding can come from muslces, joints, and more

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Hemophilia is a coagulation disorder of the blood that results in a lack of platelets, clotting factors, vitamin K, and fibrinogen in individuals. These affect the blood's ability to form a clot, meaning that individuals with hemophilia bleed more and longer than normal due to certain clotting factors that are either decreased in quantity, absent, or improperly formed. It can be mild, moderate, or severe based on the kind of bleeding episode, form of injury, or amount of present clotting factors. These episodes can be a result of injuries or simple actions, and the bleeding can be internal.

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Type A means that the level of the clotting factor IX (nine) is lower than normal

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Hemophilia. (2017). In CareNotes and Truven Health Analytics. Retrieved from http://link.galegroup.com/apps/doc/A503762464/HWRC?u=mtlib_2_754&sid=HWRC&xid=c1a4db30
Hemophilia C. (2017, December 06) from Medscape. Retrieved from https://emedicine.medscape.com/article/955690-overview
Wilson, J. F., & Lee, C. L. (2015). Hemophilia. In J. L. Longe (Ed.), The Gale Encyclopedia of Medicine (5th ed.). Farmington Hills, MI: Gale. Retrieved from http://link.galegroup.com/apps/doc/TTYKDU693945168/HWRC?u=mtlib_2_754&sid=HWRC&xid=9822c976
Hemophilia. (2017, March 02). Retrieved February 12, 2018, from https://www.cdc.gov/ncbddd/hemophilia/facts.html

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Type B means that the level of the clotting factor VII (eight) is lower than normal

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Both Hemophilia A and B have similar symptoms and can levels of severity of bleeding episodes can vary.

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There is no current cure for Hemophilia, but there are treatments that depend on the type and severity of symptoms.
The most important thing that individuals with hemophilia can do to prevent complications of this disease is to avoid injury.
Replacement therapy to replace the clotting factor that is missing or present in low amounts is the most common method of treatment. People with hemophilia are also typically vaccinated against hepatitis.
Desmopressin is a medicine that will help increase the amount of clotting factors in blood.

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Clotting factors are still present and excessive bleeding will probably only occur during surgery or due to a serious injury.

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The clotting factors are low and episodes may occur suddenly from small injuries. Excessive bleeding will likely occur during surgery.

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Frequent bleeding from your gums or nose

Heavy bleeding from injuries or after surgeries or dental work

Painful bruises that form easily after you bump a body area

Bowel movements that are black

Urine that is pink or red

Stiff, painful, or swollen joints

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Hemophilia A and B are both caused by a genetic defect present on the X chromosome. About 70% of all people with hemophilia A or B inherited the disease, and the other 30% develop it through a spontaneous gene mutation. Since the trait is carried only on the X chromosome, it is a sex-linked genetic defect. Hemophilia A and B are observed in all ethnic and racial groups, with some prevalence reported in Chinese populations.

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This type is a milder form and is a factor XI deficiency, meaning both sexes are affected

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A blow to the head, which might be totally insignificant in a normal individual, can result in bleeding into the skull and brain. Because the skull has no room for expansion, a person with hemophilia is at risk for brain damage due to blood taking up space and exerting pressure on the delicate brain tissue.

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Recently, concern has been raised about the possibility of hemophiliacs contracting Creutzfeldt–Jakob Disease from blood products.
Also, many pooled factor preparations in the 1980s were contaminated with human immunodeficiency virus (HIV). Many hemophiliacs were infected with HIV and some statistics show that HIV is still the leading cause of death among hemophiliacs. Careful methods of donor testing, as well as methods of inactivating viruses present in donated blood, have greatly lowered this risk.

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Wilson, J. F., & Lee, C. L. (2015). Hemophilia. In J. L. Longe (Ed.), The Gale Encyclopedia of Medicine (5th ed.)

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“Hemophilia: A Genetic Disorder.” Google Sites, sites.google.com/a/brvgs.k12.va.us/hemophilia-a-genetic-disorder/

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A baby suffering from hemophilia, showing a large area of bruising (hemorrhaging) over the infants... (2016). In D. S. Blanchfield (Ed.), The Gale Encyclopedia of Children's Health: Infancy through Adolescence (3rd ed., Vol. 1). Farmington Hills, MI: Gale. Retrieved from http://link.galegroup.com/apps/doc/PC3630987044/HWRC?u=mtlib_2_754&sid=HWRC&xid=9d2f2dc0

An internal hemorrhage occurring on a baby suffering from hemophilia.

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The severity of hemophilia that a person has is determined by the amount of factor in the blood. The lower the amount of the factor, the more likely it is that bleeding will occur.

The X chromosome contains many genes that are not present on the Y chromosome. This means that males only have one copy of most of the genes on the X chromosome, whereas females have 2 copies. Because of this, males can have a disease like hemophilia if they inherit an affected X chromosome whereas it is much rarer for females to have an X chromosome related disease.

Hemophilia occurs in about 1 of every 5,000 male births. Currently, about 20,000 males in the United States are living with the disorder.

Hemophilia A and B are observed in all ethnic and racial groups, with some prevalence reported in Chinese populations.