A strain is when a muscle becomes overstretched and tears. This painful injury, also called a "pulled muscle," can be caused by an accident, improper use of a muscle, or overuse of a muscle.

SIGNS
Pain and difficulty moving the injured muscle, discoloration of the skin, especially bruising, swelling .

FIRST AID
Apply ice immediately to reduce swelling. Wrap the ice in cloth - DO NOT place ice directly on the skin. Apply ice for 10 to 15 minutes every 1 hour for the first day and then every 3 to 4 hours.
Use ice for the first 3 days.
Rest the pulled muscle for at least a day. If possible, keep the pulled muscle elevated (above the level of the heart).
Avoid using a strained muscle while it is still painful. When the pain subsides, start activity slowly and in moderation.

CALL IMMEDIATELY FOR EMERGENCY MEDICAL ASSISTANCE IF:
You are unable to move the muscle.
The injury is bleeding.