Heel pain is a common issue for many people, but it’s not actually a single problem. Many different conditions can cause heel pain. The most common culprit is plantar fasciitis, which involves excessive strain and pressure on the plantar fascia ligament. The ligament develops tiny tears, thickens, and tightens, so it pulls on the heel bone, causing pain. Conditions like Achilles Tendinitis are common as well. Pressure and stress on the Achilles causes swelling and irritation on the back of your foot.