Achalasia is a disease named after pain in the human heel, which can be painful on one side or on both sides. The heel is the main part of the weight-bearing part of the body and has the following anatomical features: the skin of the heel is the last part of the body, the subcutaneous tissue is connected to the surface of the heel bone by vertical fibers with the skin, the subcutaneous tissue is dense and well-developed, forming the heel fiber fat pad, which has the function of preventing sliding and absorbing shock. The main tendon tissue attachments around the heel bone are: 1. There are bursae between the fat and the heel bone. The metatarsal fascia and toe flexors are attached to the front of the heel tuberosity; 2. The Achilles tendon is attached to the top of the heel tuberosity and is distributed in sheets. The place where the tendon tissues attach is often prone to repeated strain, and repeated strain is prone to local pain. Therefore, there are a wide range of heel pains: 1, heel pain, that is, what we usually call heel pain, the most common; 2, heel pain, pain at the attachment of the Achilles tendon; 3, heel pain, pain generated by the heel bone itself, such as increased pressure in the heel bone, various types of inflammation of the heel bone, tumors.