Also called: Hematoma · Hemorrhage
Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
About Bleeding
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.
It sits within Blood, Heart and Circulation, Injuries and Wounds and Symptoms.
When to speak to someone. Reading about a topic cannot tell you whether it applies to you. Speak to a doctor or pharmacist if symptoms are severe, sudden, getting worse, or simply not going away — and seek emergency care immediately for chest pain, breathing difficulty, sudden weakness or confusion, or a serious allergic reaction.
Research on Bleeding
7,081 studies areregistered for this condition on ClinicalTrials.gov, the U.S. National Library of Medicine's public registry. A selection is below — the links go straight to the registry entry, not to a summary of ours.
What a registered study does and does not mean. Registration means a study exists and has been declared publicly. It says nothing about whether the treatment being tested works, is safe, or is available to you. Many studies find no benefit — that is what research is for. Never seek out an experimental treatment on the strength of a registry entry alone.
Research currently under way
- Yiwu Cold Knife Technique Versus Electrocision for Multiple Endometrial PolypsThe Fourth Affiliated Hospital of Zhejiang University School of Medicine
- Pain Associated wIth traditioNal Versus uLtrasound guidEd iuS (Intra Uterine System) inSertionUniversity Hospital, Ghent
- Lumbar Drain With Intrathecal Nicardipine in Aneurysmal Subarachnoid HemorrhageWake Forest University Health Sciences
- Study of Ravulizumab in Pediatric Participants With Primary IgANAlexion Pharmaceuticals, Inc.
- Multimodal Assessment and Prognosis in Disorders of Consciousness After Severe Brain Injury (CyDoC-MAP)Nicosia General Hospital
- Harmony-HHT: ATV-1601 in Participants With Hereditary Hemorrhagic Telangiectasia (HHT)Atavistik Bio, Inc
Research already completed
- Treatment of Hereditary Hemorrhagic Telangiectasia of the Nasal Mucosa by Intranasal Bevacizumab : Search for Effective DoseUniversity Hospital, Caen
- Functional Endoscopic Sinus Surgery StudyUniversity of Florida
- Invasive Vagus Nerve Stimulation Paired With Rehabilitation After StrokeBeijing Chao Yang Hospital
- The Efficacy of Lavender Herbal Tea in Premenstrual SyndromeSakarya University
- Relationship Between Clinical Status and Nerve Conduction Test Findings in Patients With Unilateral HemiplegiaBaskent University
- Comparing the Efficacy of Toothbrushing With and Without Interproximal Cleaning Aids: A Split-Mouth TrialSaint-Joseph University
Study data from ClinicalTrials.gov, a service of the U.S. National Library of Medicine. Retrieved 2026-07-30. Registry entries are supplied by study sponsors and investigators; ClinicalTrials.gov does not verify their scientific validity. PocketsInfo is not affiliated with, and not endorsed by, the NLM or the NIH.
Where to read more
Rather than paraphrase, we point you to the primary sources. Every link below is to a government health agency, a national institute or a recognised medical body — grouped by what you are trying to find out.
Start Here
- Internal BleedingMerck & Co., Inc.
Diagnosis and Tests
- Blood Test: Factor VIII ActivityNemours Foundation
- Blood Test: Prothrombin Time (PT)Nemours Foundation
- Partial Thromboplastin Time (PTT) TestNational Library of Medicine
Treatments and Therapies
- Severe Bleeding: First AidMayo Foundation for Medical Education and Research
- What Do I Need in My First Aid Kit?American Academy of Family Physicians
Genetics
- Warfarin sensitivity: MedlinePlus GeneticsNational Library of Medicine
Clinical Trials
- ClinicalTrials.gov: HematomaNational Institutes of Health
- ClinicalTrials.gov: HemorrhageNational Institutes of Health
Medical subject headings
Clinicians and researchers index this subject under Hemorrhage. These are the terms to use when searching medical literature.
This page is built from the MedlinePlus health topic record for Bleeding, a service of the U.S. National Library of Medicine (NLM), National Institutes of Health. Information is from MedlinePlus.gov. PocketsInfo is not affiliated with, and is not endorsed by, the NLM or the NIH. Retrieved 30 July 2026.