Pain in the heart of the left foot is generally considered to be a precursor of plantar fasciitis because plantar fasciitis starts at the heel bone and ends at the base of the first metatarsal to the fifth metatarsal. When frequent weight-bearing activities, such as frequent hiking, hiking, long-distance walking, or going up and down stairs, can cause increased tension in the plantar tendon membrane and therefore predispose to plantar fasciitis strain, mainly manifesting as pain in the plantar heart, but also in the heel bone area. If this occurs, excessive physical activity and weight-bearing walking must be prohibited, and rest is generally required for about two weeks. You can use hot water to soak your feet, or you can use conventional anti-inflammatory and analgesic drugs to relieve the symptoms of inflammation.