Bleeding is the loss of blood. It can be external, or outside the body, like when you get a cut or wound. It can also be internal, or inside the body, like when you have an injury to an internal organ. Some bleeding, such as gastrointestinal bleeding, coughing up blood, or vaginal bleeding, can be a symptom of a disease.
Normally, when you are injured and start bleeding, a blood clot forms to stop the bleeding quickly. Afterwards, the clot dissolves naturally. To be able to make a clot, your blood needs blood proteins called clotting factors and a type of blood cell called platelets. Some people have a problem with clotting, due to another medical condition or an inherited disease. There are two types of problems:
- Your blood may not form clots normally, known as a bleeding disorder. This happens when your body does not make enough platelets or clotting factors, or they don't work the way they should.
- Your blood may make too many clots, or the clots may not dissolve properly
Sometimes bleeding can cause other problems. A bruise is bleeding under the skin. Some strokes are caused by bleeding in the brain. Severe bleeding may require first aid or a trip to the emergency room.
- Anemia Due to Excessive Bleeding (Merck & Co., Inc.) Also in Spanish
- Blood in Urine (National Library of Medicine) Also in Spanish
- Cavernous Angioma and Hemorrhage (Angioma Alliance)
- Facts about Vitamin K Deficiency Bleeding (Centers for Disease Control and Prevention) Also in Spanish
- Gastrointestinal Bleeding: MedlinePlus Health Topic (National Library of Medicine) Also in Spanish
- Intracerebral Hemorrhage (Washington University, School of Medicine)
- Intracranial Hematoma (Mayo Foundation for Medical Education and Research) Also in Spanish
- Nosebleeds (American Academy of Family Physicians) Also in Spanish
- Subarachnoid Hemorrhage (American Academy of Neurology) - PDF
- Subconjunctival Hemorrhage (Broken Blood Vessel in Eye) (Mayo Foundation for Medical Education and Research)
- Vaginal Bleeding: MedlinePlus Health Topic (National Library of Medicine) Also in Spanish
- Genetics Home Reference: warfarin sensitivity (National Library of Medicine)
Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)
- Article: Characterization of tracheotomized patients after spontaneous subarachnoid hemorrhage.
- Article: Perihematomal edema surrounding spontaneous intracerebral hemorrhage by CT: Ellipsoidal versus morphometric...
- Article: Comparison of ventriculoperitoneal shunt to lumboperitoneal shunt in the treatment of...
- Bleeding -- see more articles
- Hematology Glossary (American Society of Hematology)
- Blood in the Urine (Hematuria) (For Parents) (Nemours Foundation) Also in Spanish
- Dealing with Cuts (For Parents) (Nemours Foundation) Also in Spanish
- Going with the Flow of Nosebleeds (Nemours Foundation) Also in Spanish
- Nosebleeds (For Parents) (Nemours Foundation) Also in Spanish
- What's a Scab? (Nemours Foundation) Also in Spanish
- Bleeding (Medical Encyclopedia) Also in Spanish
- Bleeding gums (Medical Encyclopedia) Also in Spanish
- Bleeding into the skin (Medical Encyclopedia) Also in Spanish
- Intraventricular hemorrhage of the newborn (Medical Encyclopedia) Also in Spanish
- Subarachnoid hemorrhage (Medical Encyclopedia) Also in Spanish