What are the two main causes of traumatic brain injury in the US?

Traumatic brain injury or TBI results from a major insult (injury) to the brain. So, contact sports, motor vehicle accident, or a fall that injures the head / skull can result in TBI.

Anaphylactic shock is a life-threatening physical reaction to an allergen, such as an overwhelming reaction to a bee sting, food allergy, medication allergy or side effect. The most common cause of anaphylactic shock arise from these 3 main causes.