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Groin & buttock


Sacroilitis is an inflammation of one or both of your sacroiliac joints — the places where your lower spine and pelvis connect. Sacroilitis can cause pain in your buttocks or lower back, and may even extend down one or both legs. The pain associated with sacroiliitis is often aggravated by prolonged standing or by stair climbing.

The pain associated with sacroiliitis most commonly occurs in the buttocks and lower back. It can also affect the legs, groin and even the feet. Sacroiliitis pain can be aggravated by:

  • Prolonged standing

  • Bearing more weight on one leg than the other

  • Stair climbing

  • Running

  • Taking large strides

Piriformis Syndrome

Piriformis syndrome is a condition in which the piriformis muscle, located in the buttock region, spasms and causes buttock pain. The piriformis muscle can also irritate the nearby sciatic nerve and cause pain, numbness and tingling along the back of the leg and into the foot (similar to sciatic pain).

Typical piriformis syndrome symptoms may include:

  • A dull ache in the buttock

  • Pain down the back of the thigh, calf and foot (sciatica)

  • Pain when walking up stairs or inclines

  • Increased pain after prolonged sitting

  • Reduced range of motion of the hip joint

Symptoms of piriformis syndrome often become worse after prolonged sitting, walking or running, and may feel better after lying down on the back.


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