It can be due to sciatica, arthritis(osteoarthritis or rheumatoid arthritis),trochanteric bursitis(Inflammation of the sacs or space around the joint), Tendinitis from repetitive or strenuous activity, strain or sprain of the muscles due to its overuse or infection of the hip joint
leading to necrosis. Since it is sharp stabbing pain
,so chances of sciatica are more.
Without physical examination it is very difficult to make a diagnosis.