Clinically there is no such thing as leg pain may be a sign of 8 diseases. There are many causes of leg pain, such as muscle strain, herniated disc, rheumatoid arthritis, rheumatoid arthritis, osteoarthritis and so on can cause leg pain. 1. Muscle strain: overwork or strenuous activities lead to leg muscle strain, resulting in leg pain, this time you can use anti-inflammatory painkillers for treatment, such as ibuprofen. 2. Herniated discs: Herniated discs compress the nerve roots of the lumbar vertebrae, and the nerve roots become edematous and ischemic, resulting in leg pain, which can be treated with mannitol intravenously to reduce edema and relieve pain. 3. Rheumatoid arthritis: Inflammation of the joints caused by hemolytic streptococcal infection can lead to leg pain, you can use benzylpenicillin under the guidance of the doctor to eliminate streptococcus. 4. Rheumatoid arthritis: an autoimmune disease, mainly joint lesions, can also cause leg pain, you can use some non-steroidal anti-inflammatory painkillers for treatment, such as ibuprofen. 5. Osteoarthritis: joint cartilage damage is the main cause of leg pain, you can use some anti-inflammatory analgesic drugs, such as ibuprofen. It may also be caused by varicose veins of the lower limbs, hip arthritis, necrosis of the femoral head, etc. Leg pain must go to the hospital in a timely manner to identify the cause, and then targeted treatment, do not blindly use drugs.