The Achilles tendon is the strongest and largest tendon in the body, connecting the leg to the foot as it stretches from the lower leg to the heel bone. This tendon is crucial to normal walking, as it allows the foot to rise up on the toes. If you are experiencing painful swelling in the back of your foot just above the heel, you may be suffering from Achilles tendinitis

How Do I Know I Have Achilles Tendonitis?

The sprain causes pain along the line of the Achilles tendon, particularly in the morning. The pain will also usually intensify after you run or participate in sports.