What are the potential causes of pain in the back of the upper thigh under the buttock?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Pain in the back of the upper thigh, just below the buttock, is often caused by sacroiliac joint dysfunction, sciatica, or lumbar spinal canal stenosis. These conditions occur when nerves in the lower spine or pelvis become compressed or irritated, sending pain down the back of the leg. Muscle strains, piriformis syndrome, and hamstring injuries can also produce similar symptoms.

Because the causes range from minor muscle issues to nerve compression that may worsen without treatment, identifying the source early matters. A quick, free, and confidential symptom check can help you clarify what's likely behind your pain and guide your next steps—whether that's self-care, seeing a primary care doctor, or consulting a specialist. Taking a few minutes now could save you weeks of guessing.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Pain in the back of the upper thigh under the buttock can have several causes. One possible cause is a problem with the sacroiliac joint, which connects the lower spine to the pelvis. Issues with this joint can lead to leg symptoms, including pain in the upper thigh area. Another potential cause is lumbar spinal canal stenosis, a condition where the spaces in the spine narrow and put pressure on the nerves. This can also cause pain that radiates to the upper thigh. Pain in the buttock region can also be due to inflammation of the sciatica nerve.

Possible Causes:

Sacroiliac Joint Disorder

Pain from this disorder can travel down into the leg, affecting the upper thigh.
It is often associated with discomfort in the lower back.

Lumbar Spinal Canal Stenosis

This condition involves narrowing of the spinal canal, which can compress nerves.
Pain can radiate from the lower back to the legs, including the upper thigh.

Understanding these potential causes can help in discussing symptoms with a healthcare provider for proper diagnosis and management. To get a better understanding of what might be causing your specific symptoms, try taking our free AI symptom checker for personalized insights.

(References)

Murakami E, Aizawa T, Kurosawa D, & Noguchi K. (2017). Leg symptoms associated with sacroiliac joint disorder and .... Clinical neurology and neurosurgery, 28410481.
Miyamoto M, Genbum Y, & Ito H. (2002). [Diagnosis and treatment of lumbar spinal canal stenosis]. Journal of Nippon Medical School = Nippon Ika Daigaku zasshi, 12646992.
Shams RK, Khan M, Islam A, Das MC, Chowdhury U, & Das D. (2024). A Rare Case of Partially Ossified Sacrospinous Ligament .... Mymensingh medical journal : MMJ, 39351755.

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