There are many reasons why two legs are not as thick as each other, and it is necessary to choose the treatment method according to different reasons.1. Meniscus injury of the knee joint leads to a reduction of the force on the affected side of the limb, and the leg muscles on the affected side gradually atrophy, which leads to the left and right legs not being the same thickness, and the affected side of the leg becomes thinner, and this situation needs to be treated for meniscus injury, and it will be gradually restored to normal after leg exercises.2. Lumbar disc herniation will This will lead to one side of the spinal nerves are compressed, caused by one side of the lower limb muscle nutrition is affected by the leg muscle atrophy, thinning, this situation needs to lumbar disc herniation treatment. 3, due to the work and living habits of the problem caused by a leg often need to force, will lead to one side of the leg muscles are more developed and leg thickening, this case does not need to be treated.