The pain at the bottom of the left heel may be caused by physiological factors such as heavy exercise and cold stimulation, or it may be caused by pathological reasons such as heel bone spurs and autoimmune diseases. 1. Physiological factors: the heel area is the heel bone, the heel bone has the plantar fascia, as well as the Achilles tendon and other soft tissue structures attached to the heel, if you usually have a large amount of exercise, long-term use of the left heel, the left side of the plantar fascia long-term pressure or the Achilles tendon long-term tension stimulation, triggering aseptic inflammation, pain symptoms. Long-term exposure to cold and air-conditioning in the left heel area may also cause the above symptoms. 2. Pathological causes: middle-aged and old people may have bone spurs in the left heel bone area due to age increase, long-term wear and tear of the heel bone, degenerative diseases, etc. Bone spurs will cause irritation to the surrounding soft tissues and nerve roots, and the symptoms of pain at the bottom of the left heel may also appear. These symptoms may also occur when autoimmune diseases appear to accumulate in the left heel area, such as gout and rheumatic diseases. If the patient’s symptoms of left heel bottom pain are not relieved or accompanied by other symptoms, he should go to the hospital in time, and give targeted treatment after clarifying the cause.