Plantar fasciitis is the most common cause of heel pain. Plantar fascia is a band of tissues connecting your heel bone with your toes. If you strain your plantar fascia, it will get inflamed and swollen, causing you pain when you stand or walk. Plantar fasciitis usually causes stabbing pain with your first few steps in the morning, and after long periods of standing or getting up from a seated position.
Plantar fasciitis is common in middle-aged people. It also occurs in younger people who are on their feet a lot, like athletes. It can happen in one foot or both feet.