Did you perform any strenuous activity involving the lower limbs in the past 3 days? If there is history of physical trauma to the thigh muscles then there is a good chance that the muscles may be under spasm.
Next Steps
Give the muscles rest, try using a heating pad or hot water bag over the area of pain for half an hour. stretch the painful muscles especially the hamstrings and quadriceps.
I've a constant pain in left thigh just above the knee cap. I usually work sitting at one place for hours
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