A person can feel hip and buttock pain simply if they have been sitting or lying in the same position for a long amount of time. Sitting or lying in the same position for more than a three or four hours at a time (without repositioning) can cause muscle aches in the butt and hips that could be very painful.
One of the causes of the buttock and hip pain may be because of over sitting and stress in the lower part. The remeady would be going out for a walk in the morning as well as in the evening.
If you don't have rheumatic complaint, and you are experienceing difficulty for passing urine your problems may be due to presence of urine/kidney stone. A urologist can diagnosis your problem.
If you have a sharp type pain in your buttock and hip or even down your leg also, this could bre caused by a pinched psyatic nerve. Sometimes it takes a very long time before it gets better. Physical therapy can help.