Many Possibilities: Could be due to most commonly strained musculature especially if you have slept in an awkward position or have a lot of tension. Other also very common but more complicated problems could include a disc herniations or facet joint arthritis. If no improvement after a few days without associated serious side effects, discuss further with your pcp.
Answered 9/28/2016
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4 doctors weighed in across 2 answers
A doctor has provided 1 answer
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