WebMD Answers
Anything that places sudden or unaccustomed stress on joints or muscles may cause a sprain or strain. Chronic overuse of a joint can lead to stretching of ligaments, chronic inflammation, or chronic irritation of a muscle tendon. Falls, lifting heavy objects, and the exertion of an unfamiliar sport are common culprits. Being overweight, inactive, or in poor physical condition boosts the likelihood of injury. Improperly warming up and not stretching muscles before intense physical activity can also result in injury.
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