Achilles tendonitis is an overuse injury of the achilles tendon, the band of tissue that connects calf muscles to your heel bone. The pain associated with Achilles tendinitis typically begins as a mild ache in the back of the leg and/or above the heel.
Achilles tendinitis most commonly occurs in runners who have suddenly increased the intensity or duration of their runs. It’s also common in middle-aged people who play sports, such as tennis or basketball, only on the weekends.
Initially, achilles tendonitis may be just tenderness or stiffness, especially in the morning, which usually improves with mild activity. But as it progresses, it will create pain, discomfort, and tightness regardless of activity. More- serious cases of Achilles tendinitis can lead to tendon tears (ruptures) that may require surgical repair.