A concussion can be caused by a direct blow to the head, neck, face or somewhere else on the body with the force being transmitted to the head. This may cause you to lose consciousness – be "knocked out" - but not always.
A hip fracture is a break in the thigh bone (femur) of your hip joint. The incidence of hip fractures increases with age, doubling for each decade after age 50. The majority of hip fractures happen to people older than age 60.
Stroke - where a blood vessel in the brain is blocked or bursts - is a serious condition that requires clinical care by a physician or other health care professional; brain damage can occur within minutes of having a stroke.