The hardness or tightness of the plantar fascia may be caused by physiological reasons such as poor posture, as well as pathological reasons such as foot infections. 1. Physiological causes: mainly due to prolonged standing, local plantar cold, excessive wear and tear and other factors, physiological causes can cause fatigue injury to the plantar fascia, fascial tension, spasms, local blood circulation is reduced, thickening of the plantar corium such as callus and so on, resulting in aseptic inflammation of the plantar fascia, appearing plantar stiffness symptoms. 2. Pathological causes: mainly refers to various causes of pathogenic bacterial infectious diseases, common such as keratosis pilaris, foot keratosis eczema, metatarsal warts, palmoplantar keratosis and so on. Pathological causes can lead to hyperkeratosis of the foot skin, thickening and hardening of the stratum corneum, and even cracking and bleeding, resulting in symptoms of plantar fascia hardening. The symptoms of plantar fascia hardness alone cannot determine the cause accurately, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of a doctor.