Plantar fasciitis occurs when the thick band of tissue (called the plantar fascia) that connects the front of your foot to your heel becomes overly stretched. This causes the tissue to become irritated and inflamed, leading to heel pain.
Plantar fasciitis pain is often more severe after a period of rest—for example, after a long car ride, or while taking your first few steps out of bed in the morning. The condition can make it difficult to exercise, play sports, and perform daily activities. It can also interfere with your ability to work, especially if you spend a lot of time on your feet.