Bruise
A bruise is a hematoma from capillary damage due to trauma.
Wikipedia / Wikimedia Commons
A bruise, also known as a contusion, is a type of hematoma of tissue caused by capillaries damaged by trauma, leading to localized bleeding that extravasates into surrounding interstitial tissues. Most bruises occur close enough to the epidermis to cause visible discoloration, and they remain visible until the blood is absorbed by tissues or cleared by immune system action.
- field
- Medicine
- known_for
- Common type of hematoma from blunt trauma
- related_terms
- Contusion, ecchymosis, petechia, purpura
Lore & Background
Bruises are caused by internal bleeding into interstitial tissues that does not break the skin, usually initiated by blunt trauma from accidents, falls, or surgeries. They often induce pain immediately after trauma, and their severity depends on factors such as tissue type, age, gender, skin tone, and underlying diseases. Bruise colors vary from red, blue, or almost black, and older bruises may appear yellow, green, or brown.
Bruises are not to be confused with petechiae (less than 3 mm), purpura (3–10 mm), or ecchymoses (over 1 cm), though some schemas treat ecchymosis as synonymous with bruise. Ecchymosis can be differentiated by its remoteness from the source of bleeding, as in periorbital ecchymosis from a basilar skull fracture or neuroblastoma. Coagulopathies such as hemophilia A, medications like betamethasone, and connective tissue disorders such as Ehlers–Danlos syndrome can cause easy or spontaneous bruising.
Reader's Guide
Bruises are significant as a common clinical sign of trauma and underlying medical conditions. They can indicate serious issues such as fractures, internal bleeding, or diseases like leukemia and meningococcal infection. Unexplained bruising may signal child abuse, domestic abuse, or serious medical problems. The severity of bruising is scored on a scale from 0 to 5, with severe cases potentially causing compartment syndrome or traumatic brain injury. Bruises also have forensic importance: during an autopsy, bruises accompanying abrasions indicate the injury occurred while the individual was alive. Understanding bruise mechanisms helps in diagnosing coagulation disorders, vascular diseases, and in assessing trauma severity. The distinction between bruises and other lesions like petechiae and purpura is critical for accurate medical diagnosis.
Did You Know?
- Bruises that do not blanch under pressure can involve capillaries at the level of skin, subcutaneous tissue, muscle, or bone.
- Natural redheads have been shown to bruise more, though this may be due to greater visibility on lighter complexions.
- Bruising present around the navel with severe abdominal pain suggests acute pancreatitis.
- During an autopsy, bruises accompanying abrasions indicate the abrasions occurred while the individual was alive.
Frequently Asked Questions
What is a bruise in surgery & trauma?
A bruise, or contusion, is a localized hematoma that forms when blunt trauma ruptures capillaries, causing blood to leak into the surrounding interstitial tissue. It is one of the most common soft-tissue injuries encountered in trauma care.
What causes a bruise to form?
Blunt force trauma damages the small capillaries in the affected area, and the resulting localized bleeding extravasates into the nearby interstitial spaces. This trapped collection of blood is what we recognize as a bruise.
Why is a bruise visible on the skin?
Most bruises occur close enough to the epidermis that the pooled blood produces a noticeable discoloration on the surface. The color fades only once the body's tissues absorb the leaked blood or the immune system clears it away.
How long does a bruise typically persist?
A bruise stays visible for as long as the extravasated blood remains in the tissue. It resolves once local tissues reabsorb the blood or immune-system action clears it, at which point the discoloration disappears.
What related terms should I know alongside bruise?
The medical synonym for bruise is contusion, and closely related terms include ecchymosis, petechia, and purpura. These describe different patterns or severities of blood leaking into tissue from damaged vessels.
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