From your description, it's likely that you are suffering from Trochanteric bursitis - it means there is inflammation of the bursa (which is a cushion) between the thigh bone and the iliotibial band which is a large muscle connecting the pelvis all the way to the knee. Typically it's a combination of tight muscle and excessive repetitive exercises that caused the inflammation (you can try rubbing your hands forcefully for 1000 times, I am sure you will feel some discomfort).
Of course, there are many other causes of hip pain:
1. Muscle tear
2. Hip joint problem (arthritis/ Avascular necrosis of the hip/ Labral Tear)
3. Fracture of the bone
4. Any kind of abnormal growth
5. Referred pain from the Spine
I'd recommend you to see an Orthopaedic Surgeon, we will take a detailed clinical history and careful clinical examinations and some forms of imaging (X rays/ MRI) to fully evaluate your condition, only when the cause of the symptoms are confirmed, then we can tailor our treatment to target at the root cause of your symptoms.
The initial treatment will include anti-inflammatory medication, stretching and ultrasound therapy by the physiotherapists. However, if the pain persists despite these treatment, then the patient may need a anti-inflammatory medication injection or even surgery for recalcitrant cases. Hope this clear some doubts for you.
Cheers,
Dr. Henry Chan