Bruise is a hemorrhage under the skin caused by contusion. Wound: cuts and grazes are injuries to or through the skin, that cause bleeding (i.e. a laceration). Burns are injuries caused by excess heat, chemical exposure, or sometimes cold (frostbite). Fractures are injuries to bones. Joint dislocation is a displacement of a bone from its normal joint, such as a dislocated shoulder or finger. Concussion is mild traumatic brain injury caused by a blow, without any penetration into the skull or brain. Sprain is an injury which occurs to ligaments caused by a sudden over stretching; a strain injures muscles. Shock is a serious medical condition where the tissues cannot obtain sufficient oxygen and nutrients. Amputation is the removal of a body extremity by trauma or surgery. Serious bodily injury is any injury or injuries to the body that substantially risks death of the victim.