The symptoms of acidity in one lower extremity, consider the following factors: First, there is injury and strain in one lower extremity, such as long time high load work in one lower extremity, strain and contusion in one lower extremity caused by strenuous exercise, thus producing acidity symptoms. Second, the blood circulation of one lower limb is poor, such as phlebitis, varicose veins, etc., causing stagnation of blood, resulting in acidity, swelling and uncomfortable feeling. Third, there are problems with the nerves of one lower limb, which can be seen in neuritis and sciatica of the lower limb, and also include lumbar disc herniation and lumbar spinal stenosis, which affect the nerves of the lower limb and cause soreness and swelling and uncomfortable feeling. Fourth, systemic diseases, such as diabetes, renal insufficiency, and metabolic diseases, cause soreness and swelling in one lower limb. Patients with these symptoms are recommended to go to the hospital for detailed examination.