If you have pain and tenderness at the bottom of your foot, you may have plantar fasciitis. The tenderness is usually located near the heel, but sometimes the entire sole of the foot hurts. Plantar fasciitis typically begins gradually with mild pain in the heel, often referred to as a stone bruise. Most people feel it after, rather than during exercise. The pain usually occurs right after getting out of bed in the morning and after sitting. It can often make walking and running difficult, especially on hard surfaces. Sometimes the bottom of the foot can feel warm, swollen, and tender.