I'm experiencing a sharp, gripping pain in my upper thigh. rest relieves the pain, but when i walk the pain shoots across my upper thigh.

Thigh pain: Such Sharp pain in the upper thigh may be due to a nerve impingement in the groin. Another possibility is a hernia which can be barely noticeable. If this discomfort continues it's recommended that you be examined by a physician and,if advisable, he/she will refer you to a specialist for diagnosis and treatment depending on their findings.