A spasm is an involuntary tightening of muscle in your body. It often causes intense pain. This pain can last for minutes, hours, or days after the muscle relaxes and the spasm subsides. Spasms can ...
Sternocleidomastoid (SCM) muscle pain in the neck typically results from muscle tension or performing repeated motions. It can also occur with certain health conditions, such as asthma and pneumonia.
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