Calf a thick a thin consider muscle atrophy, lower extremity venous thrombosis, lumbar intervertebral disc herniation, to take functional exercise, medication, surgical treatment and other ways usually can be restored to normal. 1. Muscle atrophy: If the muscle atrophy is caused by lower limb surgery or long bed-ridden time, you can perform quadriceps exercises, such as straight leg raising exercises and squatting against the wall, the atrophied muscles can be slowly recovered, and the legs gradually become thicker. 2. Thick legs caused by lower extremity venous thrombosis can be treated with anticoagulant drugs such as rivaroxaban or low molecular heparin sodium under doctor’s guidance, or interventional surgery can be performed to remove the thrombus. 3. Muscle atrophy caused by lumbar intervertebral disc herniation and compression of nerves, you can take intervertebral foramenoscopy surgery to remove the protruding intervertebral discs, and take nutritive drugs such as methylcobalamin dispersible tablets orally, and you can recover slowly. Calf a thick a thin may also have other reasons, so calf a thick a thin need to identify the specific causes of the cause of treatment for the cause.