Tendonitis in the Ankle or Foot occurs when the tendons, which connect muscles to bones, become inflamed due to overuse, injury, or repetitive strain. The tendons in the ankle and foot are responsible for stabilizing and supporting movement, making them susceptible to stress and injury. The most common types of tendonitis in this region include Achilles tendonitis and peroneal tendonitis. Achilles tendonitis affects the largest tendon in the body, connecting the calf muscles to the heel bone, and is often triggered by activities like running or jumping. This condition typically causes pain, stiffness, and swelling at the back of the ankle, especially after periods of rest or following physical exertion. Peroneal tendonitis, on the other hand, involves the tendons located along the outer side of the ankle, which can lead to pain, swelling, and instability in this region, often aggravated by activities that involve excessive walking or running.

Tendonitis-related pain usually worsens with movement or activity and improves with rest, but persistent or untreated cases can escalate into more serious complications such as tendon tears, chronic inflammation, or degeneration known as tendinosis. In severe cases, tendonitis may also lead to long-term weakness or instability in the affected ankle or foot. Early treatment is crucial and typically involves a combination of rest, ice, anti-inflammatory medications, and physical therapy to strengthen the surrounding muscles and reduce strain on the tendons. In addition, the use of orthotics, braces, or supportive footwear may help offload pressure from the affected tendons, promoting healing and preventing future flare-ups. For more severe or persistent cases, corticosteroid injections or surgery might be necessary to repair damaged tendons.