Problems involving the Achilles tendon are called Achilles tendinopathy. Achilles tendon disorders include: Anterior Achilles tendon bursitis: Walking, often in high-heeled shoes, inflames the bursa at the back of your heel. Achilles paratenonitis: Overuse, repeated movements or poorly fitted shoes inflame the paratenon. Achilles tendinitis (tendonitis): Too much activity, like running, walking or sports, causes your Achilles tendon to swell and become painful. Achilles tendinosis: Overuse or aging gradually causes your tendon to degenerate, resulting in thickening due to scar tissue. Achilles tendon rupture: Running uphill, jumping or quickly changing speed or direction can tear the Achilles tendon completely or partially. Posterior Achilles tendon bursitis: Extra strain on the Achilles tendon (from injuries to the heel or diseases such as rheumatoid arthritis or gout) inflames the bursa.