Can Hematomas Cause Blood Clots

The Hidden Dangers of Hematoma-Induced Blood Clots

A hematoma is a collection of blood outside the blood vessels, usually in liquid form within the tissues. Hematomas cause bruising and swelling and often occur after an injury causing small blood vessels to rupture and leak. While harmless at first glance, can larger or traumatic hematomas increase one’s risk of developing dangerous blood clots?

A hematoma, also known as a bruise, occurs when blood vessels are damaged and leak blood into surrounding tissues. This pooled blood can put pressure on and damage surrounding tissues. Though most bruises are minor injuries that heal on their own, larger hematomas can have serious complications – including causing dangerous blood clots.

In this article, we will examine how can hematomas cause blood clots, the symptoms, and risk factors, and ways to prevent complications. By understanding the connection between bruising and clotting, the mechanisms behind hematoma-associated clotting, and when to seek urgent medical care, we can better protect ourselves from associated health dangers.

What Is Hematoma?

Hematomas, or what is commonly called bruises, arise when blunt force trauma causes tiny blood vessels under the skin to burst. Blood leaks into surrounding areas and pooling occurs.


Categorizing Hematomas By Severity And Location

They are categorized by severity and location:

Severity Location Symptoms Risk Factors
Mild Subcutaneous tissue Slight swelling, minor pain Minor trauma
Moderate Intramuscular Noticeable swelling, bruising, moderate pain Direct blow, muscle strain
Severe Retroperitoneal Extensive swelling, severe pain, internal bleeding Major trauma, surgery complications
Mild Subdural Headache, confusion, dizziness Head injury, old age
Moderate Epidural Limb weakness, continuous headache, nausea Spine injury, bleeding disorders
Severe Subarachnoid Sudden severe headache, nausea, neurological deficits Major head/spine trauma
Mild Peritoneal Mild abdominal pain Laparoscopic surgery
Moderate Hepatocellular Abdominal swelling, liver enzyme elevation Liver disease, infection
Severe Splenic Left upper quadrant pain, referred shoulder pain Abdominal trauma

What is a Blood Clot?

Before exploring the link between hematomas and blood clots, let’s first understand what a blood clot is. Clinically known as a thrombus, a blood clot is a solid mass that forms in the cardiovascular system from clumping platelets and proteins in the blood. Clots form as a normal response to injury, acting as a “plug” to stop bleeding.

Clots become problematic when they obstruct proper blood flow. This can happen when a clot travels through the arteries or veins and gets stuck, blocking the passageway. This is known as an embolism. Blood clots that form without a direct injury cause are also problematic, as they can restrict flow when not needed for wound healing.

There are two main types of concerning clots:

  • Arterial clots that form in the arteries and can lead to heart attacks or strokes
  • Venous clots that form in the veins, known as deep vein thrombosis (DVT), can break off and lead to pulmonary embolism (PE)

Both arterial and venous clots can be life-threatening if left untreated. Understanding the connection between bruising and clotting is key for early intervention.

Blood Clot
Blood Clot

Can Hematomas Cause Blood Clots?

Yes, hematomas can cause blood clots to form. There are several mechanisms by which this can occur:

  • Blood Pooling – When a blood vessel is damaged and leaks blood into the surrounding tissues, it forms a hematoma. The pooled blood contains platelets and clotting factors that can activate and trigger clot formation within the bruise itself.
  • Compression – A large or swollen hematoma can put pressure on nearby blood vessels, which can slow or alter blood flow. This change in flow and venous stasis allows clots to develop.
  • Endothelial Injury – A severe hematoma can damage the inner lining of blood vessels (the endothelium). Endothelial cells normally produce substances to prevent clotting, so injury can shift the balance toward clot promotion.
  • Inflammation – Hematomas cause inflammation and swelling of tissues. This activates the coagulation system and makes clotting more likely. Inflamed vessel walls are also more prone to clotting.
  • Turbulent Blood Flow – Hematoma compression on vessels can distort blood flow, creating turbulence. This non-smooth flow predisposes to clotting factor activation and clot formation.
  • Hypercoagulability – Some people are prone to clotting, and a hematoma can trigger clot formation in these high-risk individuals.
  • Vessel Stenosis – The pressure from a hematoma can stenose (narrow) vessels, which slows local blood flow and increases the risk of clot development.

There are multiple mechanisms by which hematomas intrinsically disrupt blood flow and activate clotting pathways in the body. This results in an increased risk of clinically significant clot formation. Proper treatment is important to minimize complications.

The Link Between Hematomas and Blood Clots

How exactly can a bruise lead to the formation of a dangerous blood clot? There are a few key mechanisms at play.

First, the blood that pools in a hematoma starts the clotting process on its own. The blood cells and platelets activated at the initial injury site will accumulate and begin clumping together. This starts the process of fibrin mesh formation and clot solidification.

Second, the pooled blood and surrounding inflammation puts pressure on blood vessels. This can cause flow restriction and turbulence, which encourages clumping and clotting factors to accumulate in the area. The hematoma essentially creates a pro-clotting environment.

Third, larger hematomas can damage the endothelial lining of blood vessels. Endothelial cells normally produce anticoagulants to prevent inappropriate clotting. When these cells are damaged, the natural anticoagulation is lost at the injury site. This creates a perfect storm for clot formation.

The size of the hematoma matters. Larger bruises have more trapped blood and often more extensive tissue damage. This means larger hematomas have higher clotting potential.

Differences in Bruises and blood clots?

Here are some key differences between a hematoma and a blood clot:


  • A hematoma is a collection of blood that has leaked from damaged blood vessels into surrounding tissues.
  • A blood clot (thrombus) is a solid mass formed from platelets, fibrin, and entrapped blood components that form inside a blood vessel.


  • Hematomas form outside vessels when blood escapes.
  • Clots form inside vessels and stay in circulation.


  • Hematomas are found in tissues under the skin or inside organs and cavities.
  • Clots are found within veins, arteries, or heart chambers.


  • Hematomas are caused by direct trauma that damages blood vessels.
  • Clots form due to abnormalities of blood flow, hypercoagulability, or vessel wall damage.


  • Hematomas can put pressure on tissues and cause pain.
  • Clots can break off and travel in the bloodstream to cause blockages.

Effects on flow

  • Hematomas can compress blood vessels.
  • Clots obstruct flow within blood vessels.


  • Hematomas are treated with RICE (rest, ice, compression, elevation).
  • Clots require anticoagulants or clot-dissolving medications.


  • Hematomas are slowly reabsorbed by the body over time.
  • Clots may dissolve gradually or require active treatment.

Though both involve blood, hematomas, and blood clots differ in location, composition, origin, risks, and treatment. However, hematomas can sometimes cause clots to form nearby due to vessel compression.


Blood Clots and Bruising

While simple minor bruising from a bump or fall poses little added clotting risk in healthy people, two issues arise with extensive injuries resulting in major hematoma formation:

Local Clot Formation Within Hematoma

Just as blood will clot when sitting in a tube, blood from vein/artery leakage tends to coagulate over hours to days – forming a localized clot meshwork. This clotting potential rises if immobilized in one location. Movement and blood flow otherwise help prevent clots. In large hematomas, these clots appear jelly-like.

Increased Systemic Clotting Tendency

Studies show trauma severe enough to cause substantial blood vessel damage, fluid leakage, and bleeding out can activate the body’s coagulation cascade. Clot-promoting proteins in the bloodstream increase.

This prepares undamaged blood vessels and wounds for healing but also predisposes to inappropriate clots. Those with certain medical conditions may be unable to regulate this, putting them at risk for events like stroke, pulmonary embolism, or DVT during injury recovery.

Risk Factors For Clotting After A Hematoma

Here is a table outlining risk factors for developing a blood clot after a hematoma:

Risk Factors for Clotting After a Hematoma

Risk Factor Description
Large hematoma size Larger pools of blood have increased clotting potential
Severe trauma More extensive tissue and vascular damage raises clot risk
Slow blood flow Conditions like heart failure or inactivity that reduce flow increase the risk
Hypercoagulability disorders Clotting disorders like factor V Leiden increase the likelihood of clotting
Family history Genetic factors that promote clotting passed down in families raise the risk
Older age Risk rises naturally with age due to vascular changes
Obesity Excess weight strains circulation and increases inflammation
Smoking Smoking damages blood vessels and increases the clotting tendency
Estrogen use Can increase clotting risk in some individuals
Cancer Certain cancers release substances that enhance clotting
Pregnancy Increased clotting factors and venous compression while pregnant
Infection Certain infections increase inflammation and activate coagulation
Surgery Vessel injury and immobilization while recovering from surgery
Central venous catheters Can cause venous irritation and flow changes that raise the risk

Preventing Clots After a Hematoma

If you develop a large or severe hematoma, there are things you can do to lower your risk of complications like blood clots:

  • Use compression – Wrapping or bracing the injured area can limit swelling and improve vein and artery flow past the hematoma. This discourages clot formation.
  • Elevate the injured limb – Keeping the bruised limb elevated above heart level uses gravity to improve drainage and blood flow.
  • Take anti-inflammatory medication – Drugs like ibuprofen limit inflammation which reduces pressure on blood vessels.
  • Increase activity gradually – A gentle range of motion and activity boosts blood flow to limit pooling.
  • Stay hydrated – Adequate fluid intake keeps blood from thickening and clotting.
  • Apply cold therapy – Icing and cooling reduce swelling and vein/artery inflammation.
  • Get checked out – Seeking prompt medical care allows assessment for anticoagulant needs.
  • Monitor for symptoms – Watch for early signs like leg swelling that may indicate clot formation.

Following your doctor’s advice is crucial after a major bruise. With proper care, most hematomas will heal without severe complications.

Hematoma Warning Signs

Here is a table outlining some of the key warning signs of a hematoma:

Location Symptoms
Abdominal Abdominal swelling, tenderness, pain, nausea, vomiting, lightheadedness
Intracranial (head) Severe headache, neurological deficits, nausea, vomiting, confusion, loss of consciousness
Spinal Back pain, limb weakness or numbness, tingling, loss of sensation, incontinence
Retroperitoneal Severe abdominal, flank or back pain, abdominal swelling, nausea, vomiting
Periorbital (eye) Bruising around the eye, pain, swelling, double vision, decreased vision
Auricular (ear) Swelling, pain, bruising over the ear, hearing changes
Muscle Pain, swelling, bruising, tenderness of the muscle
Joint Joint pain, swelling, bruising, reduced range of motion
Subungual (under nail) Pain, throbbing, nail discoloration
Intramuscular Pain, swelling, bruising, muscle dysfunction
Subcutaneous Visible bruising, pain, and swelling at the site

Diagnosing Blood Clots

Here is a table outlining some of the diagnostic tests used to diagnose blood clots:

Diagnosing Blood Clots

Test How It Works What it Diagnose
Ultrasound Uses sound waves to create images of veins and arteries Can visualize DVT in legs, PE in lungs, or blood flow issues
Venography Injects dye into veins and uses X-rays to map veins Helps diagnose DVT location and extent in legs
CT scan Takes cross-sectional X-ray images of the body Useful for finding PE, abdominal clots, and clots in the brain
MRI Uses magnetic fields to generate detailed body images Can diagnose cerebral venous thrombosis and other brain clots
Angiography Injects dye into arteries and uses X-rays to visualize the flow Helps locate arterial clots like those causing stroke/heart attack
D-dimer test Measures levels of fibrin degradation products in the blood High levels indicate clotting; used to rule out clots
Coagulation testing Measures levels of clotting factors in the blood Abnormal results may indicate a clotting disorder
ECG Records electrical activity of the heart May show arrhythmias or acute heart strain from PE/heart clots

How To Treat Hematomas Cause Blood Clots?

Here is a table summarizing the treatment options for blood clots caused by hematomas:

Treatment Description
Anticoagulants Medications like heparin, warfarin, and apixaban that reduce further clotting
Thrombolytics Medications like tPA that help dissolve existing clots
Compression stockings Improve venous circulation to prevent blood pooling in legs
Antiplatelets Medications like aspirin or clopidogrel that prevent platelets from clotting
Thrombectomy Surgical removal of large clots to rapidly restore circulation
Catheter-directed thrombolysis Clot-busting medication delivered into clots via catheter
Limb elevation Improves venous drainage and circulation
Early mobilization Prevents venous stasis by getting active again after hematoma
IVC filters Catch and prevent clots from traveling to the lungs
Estrogen avoidance Prevents recurrent clotting in those at risk
Pain control Medications to control pain related to hematoma
Cold compresses Reduce swelling and inflammation

When You Should Seek Medical Attention For A Hematoma?

Here are some key signs and symptoms that indicate you should seek medical attention for a hematoma that could be causing a blood clot:

  • Worsening pain, swelling, warmth, or redness around the site of the hematoma
  • New numbness, tingling, coolness, or changes in skin color around the hematoma
  • Shortness of breath, chest pain, palpitations, or other signs of a pulmonary embolism
  • Headaches, vision changes, weakness, slurred speech, or other signs of a stroke
  • Calf pain, swelling, warmth, or redness, which could indicate a deep vein thrombosis
  • Severe or worsening abdominal pain, swelling, vomiting, which could signal internal bleeding
  • Prolonged bleeding or pus/discharge coming from the hematoma
  • Fever, chills, or other signs of possible infection
  • Dizziness, lightheadedness, rapid heart rate, or fainting
  • Coughing up blood or blood in the urine or stool

Any concerning symptoms, worsening pain, or failure to improve within 2-3 days of a hematoma should prompt urgent evaluation. Hematomas have the potential to be very serious, so it’s important to monitor them closely and seek medical care when any worrying signs or symptoms develop. Timely treatment can help prevent complications from hematoma-associated blood clots.

How Can You Care For Yourself At Home During Hematoma?

Here are some tips for caring for yourself at home during a hematoma that could potentially cause a blood clot:

  • Use RICE – Apply rest, ice, compression, and elevation to the injured area to reduce swelling and pain. Ice for 10-20 minutes every 2-3 hours.
  • Take over-the-counter pain relievers – Medications like acetaminophen or ibuprofen can help relieve pain and reduce inflammation.
  • Drink plenty of fluids – Stay well hydrated, as this helps thin the blood and prevents clotting.
  • Immobilize the area – Use splints, slings, or braces to limit movement and prevent re-injury.
  • Apply topical Arnica – Arnica gels or creams may help reduce bruising and swelling.
  • Eat a balanced diet – Proper nutrition supports healing. Increase consumption of fruits/veggies.
  • Perform light exercise – Light walking can help with healing and prevent blood pooling in the legs.
  • Monitor for symptoms – Watch for signs like worsening pain or swelling and contact your doctor.
  • Keep the area clean – Gently clean with mild soap and water to prevent infection.
  • Avoid certain medications – Don’t take aspirin, ibuprofen, or other blood thinners unless directed by a doctor.
  • Compression bandage – Wrapping may help reduce swelling and improve circulation.
  • Elevate the area – Keep the injured limb propped up above the level of the heart when possible.
  • Consider supplements – Your doctor may recommend supplements like bromelain, vitamin K, or arnica.

Proper at-home care combined with close follow-up monitoring can promote healing and reduce complications of hematomas. Let your doctor know right away if any concerning symptoms develop.


Do small fingertip hematomas need urgent care?

No, tiny bruises and blood blisters often reabsorb quickly and rarely cause complications. Only seek care if severe pain persists over 48 hours.

Can a hip bruise mean I have a blood clot?

While deep bruising over major joints is often harmless, any leg swelling/heat with pain or shortness of breath should prompt urgent evaluation for DVT/PE.

Will aspirin help prevent clots with my bad bruising?

No, aspirin is too weak to adequately prevent extensive clotting. More aggressive anticoagulants may be given in high-risk trauma cases under close supervision.

Is it possible to die from a skin hematoma alone?

Extremely unlikely. Even large hematomas posing some clotting risk are rarely fatal alone unless they apply pressure to delicate anatomy like the brain or airway.

I bruise taking blood thinners – will stopping them help?

No, easy bruising comes with anticoagulant therapy. Stopping without provider consent greatly raises the odds of stroke/PE/DVT. Balance risks carefully.

How soon after a bruise can a clot develop?

Blood clots can begin forming in a hematoma within the first 24 hours after injury as the clotting process initiates. The risk extends for several days to weeks after as the bruise resolves.

What type of doctor treats hematoma-induced blood clots?

A hematologist may be involved to assess any blood conditions contributing to clotting. Otherwise, the specific specialist will depend on the clot location – a cardiologist for heart issues, a neurologist for stroke, etc.

Are blood thinners used to treat hematoma-related clots?

Often yes. Medications that thin the blood like heparin or warfarin are commonly used to treat clots caused by hematomas to prevent further dangerous clotting.

Is bruising easily a sign of higher clotting risk?

Yes. Easy bruising or excessive bruising with a minor injury can signal an underlying bleeding disorder. These disorders can increase the risk of both bruising and inappropriate clotting. Evaluation is a good idea.

How can you tell a bruise is turning into a dangerous blood clot?

Worsening pain, swelling, or redness around the bruise can signal clot formation. Numbness, tingling, or skin discoloration around the bruise are also concerning signs. Seek immediate medical help.

Last Words

Hematomas, or bruises, occur when blood leaks into tissues under the skin. Though most resolve easily, larger bruises can create pressure and inflammation that allows dangerous blood clots to form. Clots can travel and block arteries or veins, leading to stroke, pulmonary embolism, heart attack, and other life-threatening issues.

Knowing the signs of clotting, your personal risk factors, and ways to encourage healthy blood flow after a bad bruise can help prevent complications. Seeking prompt treatment of the first symptoms can also improve outcomes. While hematomas may seem harmless, taking the proper precautions against associated blood clots is important.


My name is Selina, a medical specialist blogger helping people access treatment for 5+ years. Although blogging awhile, only recently deeply engaged. This past year my most productive, providing hospital reviews and info on symptoms, diagnoses and diseases. Also offer guidelines to help readers navigate healthcare. Goal to continue increased content pace to assist many. Aim to facilitate treatment and empower advocacy through writing.

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