A pulled muscle can be a minor injury that just bothers you or it can be serious enough to require surgery or physical therapy. Understanding the different grades of muscle strain will guide you in treating your pulled calf muscle and knowing when to seek further medical assistance.
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A mild pulled calf muscle is described as a "grade 1" and is assigned if you have severe pain at the moment you pull your calf muscle, but are able to resume normal activity afterwards with only little or no pain when using the pulled muscle. There may be mild or no swelling.
A moderate injury, or grade 2 pulled calf muscle, is associated with loss of range of motion, or your ability to move your ankle joint. Also, you may notice that you have less strength in the muscle and may have difficulty with heavy activity.
A grade 3 pulled calf muscle is the most severe. Symptoms include severe pain that disables you from bearing weight or walking. You may notice a large bump on the back of your leg.