How severe is the pain on a scale of 0-10? Are your hip or back movements painful? Do you have any numbness or tingling in thigh? Any history of diabetes? Are you on any medications?
Thanks for your answer.
This first suspicion is pinched nerves in the back which is causing deep pain in the thigh. This can be because of the degenerative disc disease or bone spurs which may pinch the nerves. Read the resource;
Treatment is anti-inflammatory analgesics, physical therapy, deep electrotherapy, spinal braces etc.
The other differential diagnosis can be trochanteric bursitis, hip osteoarthritis which have the same management principles.
You need to see an orthopedist for the evaluation and investigations like x-ray of lower back and hip, MRI etc.
Please feel free for your follow up questions.
A ureteric stone or urinary tract infection may occasionally radiate to the thigh from the back. Usually it accompanies urinary symptoms like burning urination, increased frequency etc.
The appendix pain will have accompanied symptoms like bloating, nausea, loss of appetite, pain on the right lower quadrant of the abdomen with tenderness.
A physical examination is essential in most of the instances to confirm the diagnosis. With your severe pain, it would be advisable to visit an urgent care clinic or ER.
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Best wishes and kindest regards.