Right thigh pain can be caused by the following causes: first, cold, when cold or strain, can lead to chronic sterile inflammation of the fascia of the thigh, and lead to symptoms of thigh pain, then to early examination and examination, to exclude other diseases to diagnose and treat. Second, rheumatism and rheumatoid, rheumatism and rheumatoid can involve the muscles and fascia of the thighs, resulting in symptoms of thigh pain, which can be accompanied by morning stiffness, which should be checked early with blood tests and X-rays of the thighs, MRI for diagnosis and early treatment. Third, ankylosing spondylitis, ankylosing spondylitis patients can involve a number of joints and limbs of the muscles, fascia, and lead to thigh pain, the pain is more obvious when cold or exertion, it is necessary to check the blood tests and early examination of the thigh MRI for diagnosis and early treatment.