The Achilles tendon attaches the calf muscle to the heel bone. Achilles tendinitis is a repetitive strain (overuse) injury involving lower leg muscles and tendons at the point where they attach to the bone, resulting in pain at the back of the ankle. Chronic overuse can lead to small tears within the tendon causing long-term weakening, making the tendon susceptible to rupture, which could result in a need for surgery. See our Achilles Tendinitis exercises for more information on how to help ease your pain.
Achilles Tendinitis Quick Facts
- The Achilles tendon is the largest tendon in the body
- Achilles tendinitis is one of the most common causes of heel pain
- It frequently affects runners, walkers, and active adults
- Symptoms often worsen after activity or in the morning
- Early treatment can help prevent tendon degeneration or rupture
Achilles Tendinitis Causes
Lack of flexibility and overpronation are two of the most common causes of chronic Achilles tendinitis. Achilles tendinitis may be caused by a single incident of overstressing the tendon, or it may result from a series of stresses that produce small tears over time (overuse).
Overuse and Repetitive Stress
Running, jumping, and high-impact activities can place repeated strain on the Achilles tendon.
Tight Calf Muscles
Limited flexibility in the calf muscles increases tension on the tendon.
Improper Footwear
Shoes with poor support or worn-out cushioning may increase stress on the heel and Achilles tendon.
Sudden Increase in Activity
Rapidly increasing workout intensity or distance can overload the tendon.
Common Symptoms of Achilles Tendinitis
- Pain along the back of the heel
- Stiffness in the Achilles tendon
- Tenderness when touching the tendon
- Swelling or thickening of the tendon
- Pain that worsens after activity
Conditions Related to Achilles Tendon Pain
- Achilles tendinitis
- Achilles tendinosis
- Achilles tendon rupture
- Haglund’s deformity
- Retrocalcaneal bursitis
Treatment Options for Achilles Tendinitis
Many people find relief through a combination of rest, stretching exercises, supportive footwear, and products designed to reduce stress on the Achilles tendon. Reducing impact forces and improving flexibility can help relieve pain and support recovery.
