Concussion is a relatively mild form of traumatic brain injury, usually involving disturbances in consciousness and short-term memory loss, with patients unable to recall the incident. Symptoms may include a drop in blood pressure, pale complexion, headache, dizziness, nausea, loss of appetite, reduced memory, or lack of concentration. Long-term effects can appear three months later. Patients with concussion can be treated in neurology or neurosurgery departments, among others.