Sudden hidden pain in the right leg needs to be treated according to the specific causes, such as lumbar disc herniation, ischemic necrosis of the femoral head, osteoporosis, venous thrombosis of the lower extremities, etc. After clear diagnosis, physical therapy, medication, surgery, etc. can be taken. 1. Lumbar disc herniation: lumbar disc herniation will cause radiating pain in the lower limbs, accompanied by lumbar pain, lumbar activity limitation and other symptoms, you need to apply hot compresses to the lumbar region, and if necessary, you can take lumbar traction to lift the nerve compression, so that the patient’s right leg is suddenly hidden pain in the symptom. 2. Ischemic necrosis of the femoral head: ischemic necrosis of the femoral head can also cause hidden pain around the hip joint, thigh root and other locations, it should be to develop good habits, if necessary, can be taken to artificial total hip arthroplasty. 3. Osteoporosis: the elderly due to age-related osteoporosis can cause ischemic necrosis of the femoral head, you can take calcium supplements to relieve the symptoms, together with vitamin D3, and you can also eat more calcium-rich foods. 4. Lower extremity venous thrombosis: lower extremity venous thrombosis can also cause vague pain in the leg, need to take anticoagulant thrombolytic treatment, such as warfarin, low molecular heparin, and if necessary, can be dissolved through surgical thrombosis. The causes of sudden pain in the right leg are very many, it is recommended that patients go to the hospital in time to improve the examination, a clear diagnosis, the drug should be used under the guidance of the doctor, not to be used indiscriminately, so as not to cause adverse consequences.