Healthline lists memory problems, dizziness, headache, nausea, vomiting, balance problems, slowed reaction, light and noise sensitivity, confusion, and brief loss of consciousness after the head injury as symptoms of concussion. Concussion symptoms can occur immediately or show up months after the injury.
Healthline states that loss of consciousness does not always occur with a concussion, and the severity of the symptoms depends on the injury. Irritability and difficulty concentrating are possible symptoms of concussion recovery, and some symptoms require medical attention, although concussions are not life-threatening. Symptoms such as seizures, slurred speech, blood or clear fluid draining from the ears or nose, abnormal eye movement, repeated vomiting, coma, unequal pupil size, walking issues, and weak muscles require immediate medical attention to prevent neck or back injury.
Surgery or medical procedures reduce bleeding and swelling of the brain if serious injury occurred, but most concussions do not require this. Concussions are typically treated with over-the-counter pain relievers and rest. A person with a concussion should sleep no more than two to three hours at a time during the first 24 hours after the injury to ensure he doesn't slip into a coma, according to Healthline. Abstaining from activities that could cause another concussion while healing is important to prevent second impact syndrome, which can cause fatal brain swelling.