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Plantar fasciitis (say PLAN-ter fash-ee-EYE-tus) is the most common cause of heel pain. The plantar fascia is the flat band of tissue (ligament) that connects your heel bone to your toes. It supports the arch of your foot. If you strain your plantar fascia, it gets weak, swollen, and irritated (inflamed). Then your heel or the bottom of your foot hurts when you stand or walk.
The pain in the middle of the heel on the bottom of your foot is most often due to a problem called plantar fasciitis, which is caused by inflammation of the tissues that attach at the bottom of the heel. It will hurt when you walk as the heel touches the ground, so every step may be painful.