Concussion is a. A concussion is a traumatic brain injury that affects your brain function. Effects are usually temporary but can include headaches and. When someone has a knock to the head, the brain moves about and can knock against the skull and facial bones. This type of injury may cause the brain to swell. A concussion is a mild traumatic brain injury that results from a bump, violent jolt or blow to your head that disrupts normal brain function. A. Concussion is also often referred to as mild head injury, minor head injury or mild traumatic brain injury (mTBI). Regardless of the terminology used, the. The brain is cushioned inside the skull by the surrounding cerebrospinal fluid. Despite this, an abrupt blow to the head, or even a rapid deceleration, can. The most common and least serious type of traumatic brain injury is called a concussion. The word comes from the Latin concutere. Headache or “pressure” in head. · Nausea or vomiting. · Balance problems or dizziness, or double or blurry vision. · Bothered by light or noise. · Feeling sluggish. A concussion is a type of traumatic brain injury—or TBI—caused by a bump, blow, or jolt to the head or by a hit to the body that causes the head and brain. A concussion, also known as a mild traumatic brain injury (mTBI), is a head injury that temporarily affects brain functioning. Symptoms may include loss of.