Acute inflammation of the plantar fascia can result in a burning sensation on the bottom of the foot with redness and swelling. Plantar fasciitis is a painful condition of the bottom of the foot, located at the heel of the foot, and is a relatively common form of foot pain. So, what are the causes of the burning sensation on the bottom of the foot? The following is a brief introduction: 1. When walking, the dorsal extension of the metatarsophalangeal joint pulls on the plantar fascia, which pulls on the heel tuberosity. As we age, the foot muscles and ligaments weaken, and the plantar fascia pulls the heel tuberosity with increased force, which causes a tiny tear at the beginning of the plantar fascia due to long-term repeated pulling, followed by inflammation and pain. 2, due to the long-term role of overload pressure, resulting in acute or chronic injury to the plantar fascia, is the main cause of pain. The most common cause is often walking for long periods of time including activities such as hiking and fitness, hiking, and shopping in stores, and walking for several days in a row, it is easy to cause chronic injury to the plantar aspect of the foot, which leads to plantar fasciitis. In addition, there are structural factors that cause abnormal tension in the plantar fascia, such as flat feet, high arched feet, heel tendons are too short, etc., which may cause pain in the waist, hip, knee and ankle due to improper posture when walking in the long run.