The common causes of plantar tendon pain are plantar fasciitis and flat feet, as follows: First, plantar fasciitis: there are five tendons on the bottom of the foot leading to the five toes, and the tendons are like a fan, radiating from the heel bone to the five toes. If the patient stands, walks or wears hard shoes for a long time, the plantar fascia will become inflamed, and after inflammation, the nerve endings will be stimulated, and pain will occur, characterized by widespread pain on the bottom of the foot. The pain is characterized by widespread plantar pain, and the site of the pain is not well defined when pressure is applied. The pain is more intense in the first minute when the patient gets out of bed and walks in the morning, and gradually relieves the pain, and the pain will be relieved after applying hot water or rubbing and pressing. Secondly, flatfoot: flatfoot is also called flatfoot syndrome, which generally has a family gathering phenomenon, that is, the arch of the foot is relatively small after birth or completely flatfoot, no arch, which can be found by the naked eye during the examination in the hospital, or you can take an X-ray film to see the arch of the foot become smaller from the lateral position. With small arches, the vascular nerves on the bottom of the foot are squeezed when walking, so there is plantar tendon pain.