Symptoms usually include pain in the heel when walking or running. The tendon is usually painful to touch and the skin over the tendon may be swollen and warm.
Achilles tendinitis may make you more likely to have an Achilles rupture. This condition usually causes a sharp pain, like someone hit you in the back of the heel with a stick.
On physical exam, a doctor will look for tenderness along the tendon and for pain in the area of the tendon when the patient stands on their toes.
Imaging studies can also be helpful. X-rays can help diagnose arthritis and an MRI will demonstrate inflammation in the tendon.