Bruising or bleeding after an injury is normal (see also How Blood Clots How Blood Clots Hemostasis is the body's way of stopping injured blood vessels from bleeding. Hemostasis includes clotting of the blood. Too little clotting can cause excessive bleeding from minor injury Too... read more ). However, some people have disorders that cause them to bruise or bleed too easily. Sometimes people bleed without any obvious triggering event or injury. Spontaneous bleeding may occur in almost any part of the body, but it is most common in the nose and mouth and the digestive tract.
People with hemophilia Hemophilia Hemophilia is a hereditary bleeding disorder caused by a deficiency in one of two blood clotting factors: factor VIII or factor IX. Several different gene abnormalities can cause the disorder... read more often bleed into their joints or muscles. Most often, bleeding is minor, but it can be severe enough to be life-threatening. However, even minor bleeding is dangerous if it occurs in the brain.
Several symptoms may suggest that a person has a bleeding disorder:
Unexplained nosebleeds (epistaxis)
Excessive or prolonged menstrual blood flow (menorrhagia)
Prolonged bleeding after minor cuts, blood drawing, minor surgical or dental procedures, or tooth brushing or flossing
Unexplained skin marks, including tiny red or purple dots (petechiae), red or purple patches (purpura), bruises (ecchymoses), or small blood vessels that are widened and therefore visible in the skin or mucous membranes (telangiectasias)
Sometimes a laboratory test done for some other reason shows the person has a susceptibility to bleeding.
Three things are needed to help injured blood vessels stop bleeding: platelets Platelets The main components of blood include Plasma Red blood cells White blood cells Platelets read more (blood cells that help in blood clotting How Blood Clots Hemostasis is the body's way of stopping injured blood vessels from bleeding. Hemostasis includes clotting of the blood. Too little clotting can cause excessive bleeding from minor injury Too... read more ), blood clotting factors (proteins largely produced by the liver and by certain cells that line blood vessels), and blood vessel narrowing (constriction). An abnormality in any of these factors can lead to excessive bleeding or bruising:
Platelet disorders Overview of Platelet Disorders Platelets (sometimes called thrombocytes) are cell fragments that circulate in the bloodstream and help blood to clot. Thrombopoietin, primarily produced in the liver, stimulates the bone marrow... read more , including too few platelets (thrombocytopenia Overview of Thrombocytopenia Thrombocytopenia is a low number of platelets (thrombocytes) in the blood, which increases the risk of bleeding. Thrombocytopenia occurs when the bone marrow makes too few platelets or when... read more ), too many platelets, and defective platelet function
Decreased activity of blood clotting factors (for example, due to hemophilia Hemophilia Hemophilia is a hereditary bleeding disorder caused by a deficiency in one of two blood clotting factors: factor VIII or factor IX. Several different gene abnormalities can cause the disorder... read more , liver disorders, vitamin K deficiency Vitamin K Deficiency Vitamin K deficiency is most common in infants, especially those who are breastfed. The deficiency can cause bleeding; therefore, all newborns should be given a vitamin K injection. Bleeding... read more , or the use of certain drugs)
Defects in blood vessels
Platelet disorders first cause small red or purple dots on the skin. Later, if the disorder becomes severe, bleeding may occur. A decrease in blood clotting factors usually causes bleeding and bruising. Defects in blood vessels usually cause red or purple spots and patches on the skin, rather than bleeding.
Most commonly, easy or excessive bruising occurs because the skin and blood vessels are fragile. Women are commonly affected with purpura simplex Purpura Simplex Purpura simplex is increased bruising that is due to fragile blood vessels. Purpura simplex is extremely common. The cause is not known. Some doctors think it may be a feature of many disorders... read more . Women and older people of both sexes are commonly affected with senile purpura. Bruises tend to develop on the thighs, buttocks, and upper arms. However, people have no other symptoms of excessive bleeding, and blood test results are normal. These conditions are not serious, and no treatment is needed.
Overall, the most common causes of easy bleeding include
Severe platelet deficiency
Use of drugs that inhibit clotting (anticoagulants Anticoagulation Pulmonary embolism is the blocking of an artery of the lung (pulmonary artery) by a collection of solid material brought through the bloodstream (embolus)—usually a blood clot (thrombus) or... read more ), including heparin, warfarin, and direct oral anticoagulants
Liver disease (causing inadequate production of clotting factors)
Platelet deficiency can be due to inadequate production of platelets by the bone marrow or excessive destruction of platelets (for example, by an enlarged spleen Enlarged Spleen An enlarged spleen is not a disease in itself but the result of an underlying disorder. Many disorders can make the spleen enlarge. Many disorders, including infections, anemias, and cancers... read more or certain drugs or infections).
People who have a tendency to form blood clots may take heparin, warfarin, or direct oral anticoagulants (including dabigatran, apixaban, edoxaban, and rivaroxaban) to decrease that tendency (see Drugs and blood clots Stopping clotting Hemostasis is the body's way of stopping injured blood vessels from bleeding. Hemostasis includes clotting of the blood. Too little clotting can cause excessive bleeding from minor injury Too... read more ). However, sometimes these drugs decrease the body's clotting ability too much, and people have bleeding and/or bruising.
The liver is a major site of blood clotting factor production, and helps to regulate blood clotting, and so people with liver disease (for example, hepatitis Overview of Hepatitis Hepatitis is inflammation of the liver. (See also Overview of Acute Viral Hepatitis and Overview of Chronic Hepatitis.) Hepatitis is common throughout the world. Hepatitis can be Acute (short-lived) read more or cirrhosis Cirrhosis of the Liver Cirrhosis is the widespread distortion of the liver's internal structure that occurs when a large amount of normal liver tissue is permanently replaced with nonfunctioning scar tissue. The scar... read more ) can have a tendency to bleed easily.
Hemophilia Hemophilia Hemophilia is a hereditary bleeding disorder caused by a deficiency in one of two blood clotting factors: factor VIII or factor IX. Several different gene abnormalities can cause the disorder... read more is a hereditary disorder in which the body does not make enough of one of the clotting factors. People have excessive bleeding into deep tissues such as muscles, joints, and the back of the abdominal cavity, usually following minor trauma. Bleeding may occur in the brain, which can be fatal.
Certain disorders trigger the clotting system throughout the body. Instead of causing blood clots everywhere, platelets and clotting factors are quickly used up and bleeding occurs. This process, called disseminated intravascular coagulation Disseminated Intravascular Coagulation (DIC) Disseminated intravascular coagulation is a condition in which small blood clots develop throughout the bloodstream, blocking small blood vessels. The increased clotting depletes the platelets... read more (DIC), can be triggered by many conditions, including severe infections, severe injury, labor and delivery, and certain cancers. People with DIC are often already in a hospital. They bleed excessively from needle punctures and often have significant digestive tract bleeding.
Doctors first try to establish whether the person's symptoms actually represent easy or excessive bleeding. If so, they look for possible causes. The following information can help people know when to see a doctor and help them know what to expect during the evaluation.
In people with easy bruising or bleeding, certain symptoms and characteristics are cause for concern. They include
Symptoms of serious blood loss, such as sweating, weakness, faintness or dizziness, nausea, or extreme thirst
Pregnancy or recent delivery
Signs of infection, such as fever, chills, diarrhea, or feeling ill all over
Headache, confusion, or other sudden symptoms related to the brain or nervous system
People with warning signs should see a doctor right away, as should those who are still bleeding and those who have lost more than a small amount of blood. People without warning signs who notice that they bleed or bruise easily should call their doctor. The doctor determines how quickly to evaluate people based on their symptoms and other factors. Typically, people who do not feel well or have risk factors for bleeding, such as liver disease or use of certain drugs, or who have a family history of a bleeding disorder should be seen within a day or two. People who feel well but had a few nosebleeds that stopped on their own or who have bruises or spots on their skin can be seen when practical. A delay of a week or so is unlikely to be harmful.
Doctors first ask questions about the person's symptoms and medical history. Doctors then do a physical examination. What they find during the history and physical examination sometimes suggests a cause of the bleeding or bruising, but typically tests need to be done.
Doctors ask about types of bleeding, including frequent nosebleeds, gum bleeding while tooth brushing, coughing up blood (hemoptysis), blood in stool or urine, or dark tarry stool (melena). They also ask about other symptoms, including abdominal pain and diarrhea (suggesting a digestive disorder), joint pain (suggesting a connective tissue disorder), and lack of menstrual periods and morning sickness (suggesting pregnancy). They ask about whether the person is taking drugs (such as aspirin, indomethacin, heparin, or warfarin) that are known to increase the risk of bleeding. Easy bleeding in a person taking warfarin, especially if the dose has recently increased, is likely due to the drug. Doctors also ask if the person has a condition that is likely to cause a problem with blood clotting, such as
Severe infection, cancer, liver disease Overview of Liver Disease Liver disease can manifest in many different ways. Characteristic manifestations include Jaundice (a yellowish discoloration of the skin and whites of the eyes) Cholestasis (reduction or stoppage... read more (such as cirrhosis or hepatitis), human immunodeficiency virus infection Human Immunodeficiency Virus (HIV) Infection Human immunodeficiency virus (HIV) infection is a viral infection that progressively destroys certain white blood cells and can cause acquired immunodeficiency syndrome (AIDS). HIV is transmitted... read more (HIV infection), pregnancy, systemic lupus erythematosus Systemic Lupus Erythematosus (SLE) Systemic lupus erythematosus is a chronic autoimmune inflammatory connective tissue disorder that can involve joints, kidneys, skin, mucous membranes, and blood vessel walls. Problems in the... read more (lupus), or chronic kidney disease Chronic Kidney Disease Chronic kidney disease is a slowly progressive (months to years) decline in the kidneys’ ability to filter metabolic waste products from the blood. Major causes are diabetes and high blood pressure... read more
Prior excessive or unusual bleeding or the need for blood transfusions Overview of Blood Transfusion A blood transfusion is the transfer of blood or a blood component from one healthy person (a donor) to a sick person (a recipient). Transfusions are given to increase the blood's ability to... read more
Family history of excessive bleeding
People are asked about use of alcohol or intravenous (IV) drugs. Heavy alcohol use is a risk factor for liver disease, and IV drug use is a risk factor for HIV infection.
People with a family history of excessive bleeding are likely to have an inherited bleeding disorder such as hereditary hemorrhagic telangiectasia Hereditary Hemorrhagic Telangiectasia (HHT) Hereditary hemorrhagic telangiectasia is a hereditary disorder in which blood vessels are malformed, making them fragile and prone to bleeding. Dilated blood vessels (telangiectasia) are present... read more , hemophilia Hemophilia Hemophilia is a hereditary bleeding disorder caused by a deficiency in one of two blood clotting factors: factor VIII or factor IX. Several different gene abnormalities can cause the disorder... read more , or von Willebrand disease Von Willebrand Disease Von Willebrand disease is a hereditary deficiency or abnormality of the blood protein von Willebrand factor, which affects platelet function. (See also Overview of Platelet Disorders and Overview... read more . However, not all people with these disorders know about a family history of the disorder.
During the physical examination, doctors check vital signs (temperature, blood pressure, and heart rate). These signs can give an early indication of serious disorders, especially low blood volume or an infection. A high heart rate together with low blood pressure suggests low blood volume due to bleeding. Fever suggests an infection.
Doctors examine the skin and mucous membranes (nose, mouth, and vagina) looking for signs of bleeding. A digital rectal examination is done to look for bleeding from the digestive tract. Doctors also look for signs, such as tenderness during movement and local swelling, that may indicate bleeding in deeper tissues. A person with bleeding inside the head may have confusion, a stiff neck, or neurologic abnormalities (such as headache, vision problems or weakness). The sites of bleeding may offer a clue to the cause. Bleeding from superficial sites, including skin and mucous membranes, suggests a problem with platelets or blood vessels. On the other hand, bleeding into deep tissues suggests a problem with clotting.
Additional findings may help doctors narrow the cause. Accumulation of fluid in the abdomen (ascites), an enlarged spleen (splenomegaly), and yellow color of the skin and/or eyes (jaundice) suggest bleeding caused by liver disease. A woman who is pregnant or has recently delivered or a person who is in shock Shock Shock is a life-threatening condition in which blood flow to the organs is low, decreasing delivery of oxygen and thus causing organ damage and sometimes death. Blood pressure is usually low... read more or has a fever, chills, and other signs of serious infection is at risk of disseminated intravascular coagulation Disseminated Intravascular Coagulation (DIC) Disseminated intravascular coagulation is a condition in which small blood clots develop throughout the bloodstream, blocking small blood vessels. The increased clotting depletes the platelets... read more . In children, fever and digestive upset, especially bloody diarrhea, suggest hemolytic-uremic syndrome Hemolytic-Uremic Syndrome (HUS) Hemolytic-uremic syndrome (HUS) is a serious disorder that usually occurs in children and involves the formation of small blood clots throughout the body that block the flow of blood to vital... read more . A rash on the legs, joint pain, and digestive upset suggest immunoglobulin─A associated vasculitis Immunoglobulin A–Associated Vasculitis Immunoglobulin A–associated vasculitis (formerly called Henoch-Schönlein purpura) is inflammation of mainly small blood vessels that most often occurs in children. A rash of reddish purple bumps... read more .
Most people with excessive bleeding require blood tests. The initial tests are
Complete blood count Complete blood count Doctors select tests to help diagnose blood disorders based on the person's symptoms and the results of the physical examination. Sometimes a blood disorder causes no symptoms but is discovered... read more (including platelet count), which evaluates all the cellular components of a blood sample
Peripheral blood smear (examination of a sample of blood under a microscope to see whether blood cells are damaged, abnormal, or immature)
Prothrombin time (PT) and partial thromboplastin time (PTT), which measure the activity of blood clotting factors Clotting tests Doctors select tests to help diagnose blood disorders based on the person's symptoms and the results of the physical examination. Sometimes a blood disorder causes no symptoms but is discovered... read more
These tests are considered screening tests. They are done to determine whether the clotting system is normal. If one of these tests reveals an abnormality, additional tests are usually needed to identify the cause.
Other blood tests may be needed to confirm bleeding caused by HIV infection or hepatitis. A bone marrow biopsy Bone Marrow Examination Red blood cells, most white blood cells, and platelets are produced in the bone marrow, the soft fatty tissue inside bone cavities. Sometimes a sample of bone marrow must be examined to determine... read more may be needed if doctors suspect a bone marrow disorder.
Imaging tests are often done to detect internal bleeding in people with bleeding disorders. For example, computed tomography Computed Tomography (CT) In computed tomography (CT), which used to be called computed axial tomography (CAT), an x-ray source and x-ray detector rotate around a person. In modern scanners, the x-ray detector usually... read more (CT) of the head should be done in people with severe headaches, head injuries, or impairment of consciousness. Abdominal CT is done in people with abdominal pain.
The specific treatment for easy bruising and bleeding depends on the cause. For example,
People with more serious bleeding need intravenous fluids and sometimes blood transfusions Overview of Blood Transfusion A blood transfusion is the transfer of blood or a blood component from one healthy person (a donor) to a sick person (a recipient). Transfusions are given to increase the blood's ability to... read more . Those with a very low platelet count often need platelet transfusions Platelets People are sometimes given transfusions of whole blood during severe bleeding (for example after an injury or pregnancy complications), but usually they are given only the blood component they... read more . Doctors may give fresh frozen plasma Plasma People are sometimes given transfusions of whole blood during severe bleeding (for example after an injury or pregnancy complications), but usually they are given only the blood component they... read more , which contains all clotting factors, to a person with a clotting disorder until the specific deficiency has been identified. Once the deficient factor is identified, the person can be given a transfusion of that clotting factor Blood clotting factors Hemostasis is the body's way of stopping injured blood vessels from bleeding. Hemostasis includes clotting of the blood. Too little clotting can cause excessive bleeding from minor injury Too... read more .
People with easy bruising due to skin and blood vessel fragility do not need to be treated, although doctors sometimes suggest that people avoid taking aspirin and nonsteroidal anti-inflammatory drugs (NSAIDs).
Older people may be more prone to easy bruising. As people age, the skin thins and people lose some of the protective layer of fat below the skin surface. So a minor bump is more likely to cause blood vessels to break, leading to bruising. Also, the small blood vessels themselves become less elastic and more fragile, leading to easier bruising. Older people also are more likely to take aspirin, clopidogrel, warfarin, or direct oral anticoagulants, which make bruising and bleeding more likely.
Excessive bleeding may occur on its own or after minor injury.
Bleeding can range from minimal to massive and is very dangerous if it occurs within the brain.
Liver disease, low platelet count, and certain drugs (especially warfarin, heparin, aspirin, and nonsteroidal anti-inflammatory drugs ) are common causes.
Disseminated intravascular coagulation is an uncommon but serious cause that most often develops in people who are already ill or in the hospital.
Easy bruising is common and is rarely a cause for concern if people feel well and have no other signs of easy bleeding.