The cause of foot pain may be muscle strain, arthritis, inflammation of plantar fascia, etc. 1. Muscle strain: prolonged standing, walking or strenuous exercise can lead to strain of the foot muscles and excessive accumulation of lactic acid, which can lead to pain when the sole of the foot hits the ground. 2. Arthritis: In the acute stage of osteoarthritis, gouty arthritis, rheumatoid arthritis, etc., it can be manifested as pain in the feet, and in serious cases, the activities are limited, and the symptoms of pain when the feet touch the ground appear. 3. Inflammation of plantar fascia: Long-term weight-bearing walking, stair climbing, mountaineering, etc., will lead to plantar fascia under high tension, resulting in pain in the foot, mostly in the sole of the foot. The cause cannot be accurately determined solely by the pain when the foot plate hits the ground, but also needs to be combined with the characteristics of the medical history and other examination results to make an accurate judgment, and it is recommended to clarify the cause of the disease under the guidance of the doctor.