Plantar fasciitis is common in middle-aged people. It also occurs in younger people who are on their feet a lot, like athletes or soldiers. It can happen in one foot or both feet.
Plantar fasciitis is caused by straining the ligament that supports your arch. Repeated strain can cause tiny tears in the ligament. These can lead to pain and swelling. This is more likely to happen if:
- Your feet roll inward too much when you walk
- You have high arches or flat feet.
- You walk, stand, or run for long periods of time, especially on hard surfaces.
- You are overweight
- You wear shoes that don’t fit well or are worn out.
- You have tight achilles tendon or calf muscles.
Most people with plantar fasciitis have pain when they take their first steps after they get out of bed or sit for a long time. You may have less stiffness and pain after you take a few steps. But your foot may hurt more as the day goes on. It may hurt the most when you climb stairs or after you stand for a long time.