Overview
Blood clotting is the body's way of stopping bleeding after an injury. A clotting disorder happens when this system does not work normally, either causing too much bleeding or causing clots to form when they should not. Examples include bleeding disorders such as hemophilia and von Willebrand disease, and clotting conditions such as deep vein thrombosis or inherited thrombophilia.
Key Symptoms
Bleeding-related symptoms may include frequent nosebleeds, bleeding gums, heavy menstrual bleeding, easy bruising, bleeding that lasts longer than expected, or blood in urine or stool. Clot-related symptoms depend on where the clot forms and may include leg pain or swelling, chest pain, sudden shortness of breath, severe headache, trouble speaking, or weakness on one side of the body. Some people have no symptoms until surgery, injury, pregnancy, or a major illness.
Causes and Risk Factors
Some clotting disorders are inherited and run in families. Others happen because of liver disease, vitamin K deficiency, autoimmune disease, cancer, infection, pregnancy, long periods of not moving, smoking, or certain medicines such as blood thinners, hormone therapy, or some cancer treatments. Risk factors for harmful clots can also include surgery, hospitalization, obesity, and older age.
Who Is Affected
Blood clotting disorders can affect people of any age, sex, or background. Some inherited bleeding disorders are noticed in childhood, while many clotting disorders are first found in adulthood. Pregnancy and the weeks after birth can raise the risk of some clotting problems.
Prevention
Not all clotting disorders can be prevented, especially inherited ones. However, lowering clot risk may involve staying active, moving during long travel, following medical advice after surgery, not smoking, and managing long-term health conditions. If you have a known disorder or a strong family history, tell your healthcare team before surgery, dental work, pregnancy care, or starting new medicines.
Diagnosis and Tests
A healthcare professional may ask about symptoms, family history, medicines, menstrual bleeding, past surgeries, and any previous clots or unusual bleeding. Testing may include blood counts, clotting studies, tests for clotting factors, and tests to look for inherited conditions. If a harmful clot is suspected, imaging tests such as ultrasound or scans may be used.
Treatment Categories
Treatment depends on whether the problem is too much bleeding or too much clotting, and on the cause. Care may include monitoring, treating the underlying illness, replacing missing clotting factors, or using medicines that help prevent or break down clots. People taking clot-related treatment usually need follow-up because treatment can lower one risk while raising bleeding risk.
Living With It
Living with a clotting disorder often means learning your personal warning signs and keeping regular medical follow-up. It may help to carry medical information about your condition and medicines, especially if you have a history of severe bleeding or dangerous clots. Family members may also need advice about whether they should be evaluated.
When to Seek Medical Care
Arrange medical care if you have repeated nosebleeds, unusual bruising, very heavy periods, bleeding after minor injury that is hard to stop, or a personal or family history of clotting problems. Also seek prompt care for new leg swelling, unexplained pain, or symptoms that appear after surgery, long travel, pregnancy, or a new medicine. Early assessment can help reduce complications.
When It May Be an Emergency
Get emergency help right away for severe bleeding, vomiting blood, black or bloody stools, coughing blood, a major head injury while on blood-thinning medicine, or bleeding that will not stop. Emergency care is also needed for chest pain, sudden shortness of breath, fainting, severe headache, sudden vision changes, trouble speaking, or weakness or numbness on one side, because these can be signs of a serious blood clot.