Achilles Tendonitis is an overuse injury causing pain, inflammation and or degeneration of the Achilles tendon at the back of the ankle. Too much too soon is the common cause of overuse injuries, however other factors can contribute to developing the condition.

Causes

• An increase in activity. An increase in activity, either distance, speed or terrain.
• Change of footwear or training surface. A change of footwear or training surface for example suddenly running on soft sand can cause the heel to drop lower than normal making the tendon stretch further than it is used to.
• Weak calf muscles. Weak calf muscles can tighten or go into partial spasm which again increases the strain on the Achilles tendon by shortening the muscle.
• Running up hills. The Achilles tendon has to stretch more than normal on every stride when running up hill. This is fine for a while but will mean the tendon will fatigue sooner than normal.
• Overpronation. Flat feet which roll in when running can place an increased strain on the Achilles tendon. As the foot rolls in (flattens) the lower leg also rotates inwards which places twisting stresses on the tendon.
• High Heels. Wearing high heels constantly shortens the tendon and calf muscles. When exercising in flat running shoes, the tendon is stretched beyond its normal range which places an abnormal strain on the tendon.