The Achilles tendon is the largest tendon in the human body and can withstand forces of 1,000 pounds or more. It also is the most frequently ruptured tendon, usually as a result of a sports injury. Both professional and weekend athletes may suffer from Achilles tendonitis, a common overuse injury and inflammation of the tendon.

Events that can cause Achilles tendonitis may include:

• Hill running or stair climbing.
• Overuse, stemming from the natural lack of flexibility in the calf muscles.
• Rapidly increasing mileage or speed when walking, jogging, or running.
• Starting up too quickly after a layoff in exercise or sports activity, without adequately stretching and warming up the foot.
• Trauma caused by sudden and/or hard contraction of the calf muscles when putting out extra effort, such as in a sprint.
• Improper footwear and/or a tendency toward overpronation.

Achilles tendonitis often begins with mild pain after exercise or running that gradually worsens. Other symptoms include:

• Recurring localized pain, sometimes severe, along the tendon during or a few hours after running.
• Morning tenderness about an inch and a half above the point where the Achilles tendon is attached to the heel bone.
• Sluggishness in your leg.
• Mild or severe swelling.
• Stiffness that generally diminishes as the tendon warms up with use.
   

Treatment normally includes:

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In extreme cases, surgery is performed to remove the fibrous tissue and repair any tears.