Bicycle and Motorcycle Helmets Topic Guide
Bicycle and Motorcycle Helmets: Wearing a helmet while bicycle riding, motorcycle riding, or skiing can prevent severe head trauma and disabilities. Wearing a helmet can reduce the risk of a serious head or brain injury by 85%.
Hematoma Hematoma is a collection of blood outside a blood vessel usually caused by injury to the blood vessel wall. Causes of hematoma include trauma, head injury, bumps, infections, and diseases. Symptoms may be pain, redness, and swelling. Treatment of hematoma depends on the cause.