A brain injury can cause you to have no symptoms at all, blindness, forgetfulness, epileptic-like seizures and anything else up to and including death, that includes mouth jerks too!
Yes, it can. However this condition isn't restricted to brain injury, it can caused by foods, allergies or drug interactions. You need to be evaluated by your physician.
Yes. The brain is the most important part of the bosy. if some injury takes ploace, this can cause many defects. You loose your memory, your mouth jerks, you loose your balace, etc.
