Hematoma formation is mainly caused by what?

Hematoma formation is mainly caused by what?

• A. Bacterial infection
• B. Hitting a blood vessel
• C. Allergic reaction
• D. Elevated blood pressure

Answer: (B)

A hematoma forms when a blood vessel is injured and blood leaks into surrounding tissue. Injections or trauma can puncture a vein or small artery, allowing blood to escape and pool in the tissues before clotting stops the bleed. This is why hitting a vessel during an injection is the direct cause of a hematoma. Bacterial infection would cause infection or abscess formation, not a localized collection of blood. An allergic reaction causes swelling from immune response, not blood leakage into tissues. Elevated blood pressure might worsen bleeding that has already started, but it isn’t the primary reason a hematoma develops; the key event is damage to the vessel and subsequent bleeding into the tissue.

A hematoma forms when a blood vessel is injured and blood leaks into surrounding tissue. Injections or trauma can puncture a vein or small artery, allowing blood to escape and pool in the tissues before clotting stops the bleed. This is why hitting a vessel during an injection is the direct cause of a hematoma.

Bacterial infection would cause infection or abscess formation, not a localized collection of blood. An allergic reaction causes swelling from immune response, not blood leakage into tissues. Elevated blood pressure might worsen bleeding that has already started, but it isn’t the primary reason a hematoma develops; the key event is damage to the vessel and subsequent bleeding into the tissue.