It is a cause of pain under the heel. It usually goes in time. Treatment may speed up recovery. Plantar fasciitis means inflammation of your plantar fascia. Your plantar fascia is a strong band of tissue (like a ligament) that stretches from your heel (calcaneum) to your middle foot bones. It supports the arch of your foot and also acts as a shock-absorber in your foot.You are more likely to injure your plantar fascia in certain situations. For example-If you are on your feet for a lot of the time, or if you do lots of walking, running, standing, etc, when you are not used to it .If you have recently started exercising on a different surface – for example, running on the road instead of a track.If you have been wearing shoes with poor cushioning or poor arch support.If you are overweight – this will put extra strain on your heel.If there is overuse or sudden stretching of your sole. For example – athletes who increase running intensity or distance; poor technique starting ‘off the blocks’, etc.If you have a tight Achilles tendon (the big tendon at the bottom of your calf muscles above your heel). This can affect your ability to flex your ankle and make you more likely to damage your plantar fascia.