Typically there is pain at the back of the heel after sport or other activity. The symptoms of Achilles tendinitis start as a mild pain that gets gradually worse over a period of time. The tendon is thickened and sore to touch.
The affected area tends to feel particularly stiff after long periods of rest. You may therefore feel stiffness particularly with first steps after waking up in the morning, or after sitting for a long time. The stiffness tends to improve once you are moving. The pain may increase during or after running or other physical activities. You may feel severe pain in your Achilles tendon on a day following exercise.
As well as the pain, common symptoms include swelling, tenderness, tight muscles and limited ability to flex the foot. Inflammation can also cause your foot to feel very warm. In some cases, you may even see a small hard lump, or ‘nodule’, on the back of your ankle.