What are the causes of muscle, stiffness, pain and swelling in the thigh area?

See physician . Swelling of the muscle can indicate myosotis - this can be related to injury or systemic reaction. Best to get it looked at.
Spine nerve irritate. You may have over use this muscle or that there is the spinal nerve root irritation. Spinal nerve root irritation always causes muscle spasms. If the pain is primarily due to nerve damage, there are symptoms of pins and needles, numbness, burning, shooting and sharp pains. If the pain is due to nerve irritation with predominant muscle spasm, the pain is usually aching, cramping, dull, and the.