Achilles tendinitis, also known as Achilles tendinopathy, is soreness of the Achilles tendon. It is accompanied by alterations in the tendon's structure and mechanical properties. The most common symptoms are pain and swelling around the back of the ankle. The pain is typically worse at the start of exercise and decreases thereafter. Stiffness of the ankle may also be present. Onset is generally gradual.
Achilles tendinopathy is idiopathic, meaning the cause is not well understood. Theories of causation include overuse such as running, a lifestyle that includes little exercise, high-heel shoes, rheumatoid arthritis, and medications of the fluoroquinolone or steroid class. Diagnosis is generally based on symptoms and examination.
