Hidden pain in the upper part of the right thigh, considering muscle strain, lumbar disc herniation, lateral femoral dermatitis, muscle strain and so on. 1. Muscle strain: if walking too much or strenuous running and jumping can cause quadriceps muscle strain pain, which will be alleviated after rest. 2. Lumbar disc herniation: osteophytes or herniated nucleus pulposus compressing the nerves can radiate to the thigh pain, as well as numbness in the lower limbs. 3. Lateral femoral cutaneous neuritis: due to trauma, cold, compression and other causes of lateral femoral cutaneous nerve entrapment, localized pinprick pain, numbness and ankylosing sensation in the lateral thigh. 4. Muscle strain: If the thigh is sprained due to improper exercise, it can cause thigh swelling, pain and activity limitation, and need to brake and rest for gradual recovery. Hidden pain in the upper thigh of the right leg, there may be other factors, it is recommended that patients go to the hospital in a timely manner to check and clarify the cause of treatment.