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Bruising and Bleeding

By Joel L. Moake, MD, Rice University;Baylor College of Medicine

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Bruising or bleeding after an injury is normal. 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) 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 (cell-like blood particles that help in blood clotting), blood clotting factors (proteins largely produced by the liver that are required for blood clotting), and blood vessel narrowing (constriction). An abnormality in any of these factors can lead to excessive bleeding or bruising:

  • Platelet disorders, including too few platelets (thrombocytopenia), too many platelets, and defective platelet function

  • Decreased activity of blood clotting factors (for example, due to hemophilia, liver disorders, or vitamin K deficiency or to 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.

Common causes

Overall, the most common causes of easy bleeding include

  • Severe platelet deficiency

  • Use of drugs that inhibit clotting (anticoagulants) such as warfarin or heparin

  • 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 or certain drugs or infections). People who have a tendency to form blood clots may take drugs such as heparin or warfarin to decrease that tendency. However, sometimes these drugs decrease the body's clotting ability too much, and people have bleeding and/or bruising. Because the liver helps to regulate blood clotting, people with liver disease (for example, hepatitis or cirrhosis) also have a tendency to bleed easily.

Most commonly, easy or excessive bruising occurs because the skin and blood vessels are fragile. Women and older people of both sexes are more commonly affected. 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. This condition is not serious, and no treatment is needed.

Less common causes

Hemophilia A and hemophilia B (Hemophilia) are hereditary disorders 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.

Uncommonly, 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 disorder, called disseminated intravascular coagulation (DIC---see see Disseminated Intravascular Coagulation (DIC)), can be triggered by many conditions, including severe infections, severe injury, labor and delivery, and certain cancers. People with DIC are usually already in a hospital. They bleed excessively from needle punctures and often have significant digestive tract bleeding.

Some Causes of Excessive Bleeding



Platelet disorders

Decreased number of platelets

Aplastic anemia

Cirrhosis if the spleen is enlarged

DIC if it progresses rapidly

Drugs that can trigger destruction of platelets (such as heparin, quinidine, quinine, sulfonamides, sulfonylureas, or rifampin)

Hemolytic-uremic syndrome

HIV infection

Immune thrombocytopenia


Thrombotic thrombocytopenic purpura

Increased number of platelets (which often causes excessive clotting but sometimes causes excessive bleeding)

Primary thrombocythemia

Inadequate platelet function

Drugs that can cause platelets to malfunction (such as aspirin or other NSAIDs)

Kidney failure

Multiple myeloma

Von Willebrand disease

Clotting disorders


Anticoagulants (drugs that inhibit clotting) such as warfarin or heparin

DIC if it progresses slowly

Liver disease

Vitamin K deficiency



Blood vessel disorders


Immunoglobulin A–associated vasculitis (Henoch-Schönlein purpura)

Vitamin C deficiency


Connective tissue disorders (such as Marfan syndrome)

Hereditary hemorrhagic telangiectasia

DIC = disseminated intravascular coagulation; HIV = human immunodeficiency virus; NSAIDs = nonsteroidal anti-inflammatory drugs.


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.

Warning signs

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

When to see a doctor

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.

What the doctor does

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 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 (such as cirrhosis or hepatitis), human immunodeficiency virus (HIV) infection, pregnancy, systemic lupus erythematosus (lupus), or kidney failure

  • Prior excessive or unusual bleeding or transfusions

  • 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, hemophilia, or von Willebrand disease. 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.

They 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. 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 or has a fever, chills, and other signs of serious infection is at risk of disseminated intravascular coagulation. In children, fever and digestive upset, especially bloody diarrhea, suggest hemolytic-uremic syndrome. A rash on the legs, joint pain, and digestive upset suggest immunoglobulin─A associated vasculitis.


Most people require blood tests. The initial tests are

  • Complete blood count (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

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 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 (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, cancers and infections are treated, causative drugs are stopped, vitamins are given for vitamin deficiency, and people with liver disease are sometimes given vitamin K or fresh frozen plasma transfusions.

People with more serious bleeding need intravenous fluids and sometimes blood transfusions. Those with a very low platelet count often need platelet transfusions. Doctors may give fresh frozen plasma, 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 that factor.

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).

Essentials for Older People

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 drugs such as warfarin and aspirin, which make bruising and bleeding more likely.

Key Points

  • 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 NSAIDs ) 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.

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