Make safety a primary consideration in the work place. When possible, take a short break when you are getting tired. Fatigue, combined with machinery, can result in an accident. Regardless of how careful you are, accidents do happen. Any head injury which is severe enough to cause bleeding or a bruise could also fracture the skull or cause concussion.
Brain damage can occur without any obvious sign.
In elderly people, particularly, any slight knock to the head may cause internal bleeding. Anyone who has suffered a possible brain injury should be taken to a doctor or to the emergency department of a hospital for examination - even if, superficially, the injury does not appear to be serious. Every fifteen seconds someone in the United States experiences a brain injury. One hundred thousand people each year are permanently affected by brain injury. It can also mean that friends and family members pull away leaving the brain injury survivor without much needed support systems.