It is normal to be more tired after a concussion. Fatigue that accompanies concussion causes mental (cognitive and emotional) and physical tiredness. Even a little effort may make you very tired at the beginning. Once energy levels are used up it can take longer to recharge after concussion.

How long does tiredness last after concussion?

Although there are limited long-term studies, some research indicates that fatigue is usually short-lived after most mild TBIs. And in my experience as a physiatrist, fatigue in patients with mild TBI usually lasts no longer than three to six months.

Is it normal to be tired when you have a concussion?

After a concussion, your brain has less energy to spare than it normally does. Everything now takes up a little more energy than before. This can make you feel tired and lose energy. This is called fatigue.