The most common reasons for normal hip joints and different leg thickness are physiological factors, nerve injury, lumbar disc herniation, bone fracture, etc. If accompanied by any uncomfortable symptoms, it is recommended to seek medical treatment in time. 1. Physiological factors: some patients are born with normal hip joints, but the thickness of the leg is not the same, there will be a slight difference, but usually no discomfort symptoms, so patients do not have to worry too much. 2. Trauma: If the nerve of one side of the lower limb is damaged, the muscles innervated by this nerve will be prone to atrophy, and the thickness of the two legs will be different. 3. Lumbar disc herniation: the herniated lumbar disc compresses the nerves, and it is easy to cause muscle atrophy of the lower limbs, and the muscle atrophy of the two legs is different, and it is easy to have normal hip joints, but the thickness of the legs is not the same. 4. Fracture: If the patient has a fracture on one side of the leg, the patient may be affected by localized swelling, poor prognosis of the fracture and other factors, and then the thickness of the two legs is not the same. Caused by the hip joint normal leg thickness is not the same reason is more, may also be related to osteoporosis, congenital developmental deformities, arteriovenous fistula and other reasons, if the rest did not relieve, it is recommended to promptly go to the hospital to find out the cause of the disease, targeted treatment.