Start by determining whether pain is located in the anterior, lateral, or posterior hip. As the site varies, so does the etiology. Besides location, consider sudden vs insidious onset, motions and positions that reproduce pain, predisposing activities, and effect of ambulation or weight bearing. Physical examination tests that elucidate range of motion, muscle strength, and pain replication will narrow the diagnostic search. Magnetic resonance imaging is usually diagnostic if plain x-rays and conservative therapy are ineffective. Conservative measures and selective use of injection therapy are usually effective.