Achilles tendinitis is a condition that occurs when the Achilles tendon, which connects the calf muscles to the heel bone, becomes inflamed. This can be caused by overuse of the tendon, particularly in sports or activities that involve running or jumping. Other factors that can contribute to the development of Achilles tendinitis include a sudden increase in physical activity, tight calf muscles, poor footwear, and certain medical conditions. Symptoms of Achilles tendinitis include pain and stiffness in the back of the leg near the heel, especially when walking or running, as well as swelling and tenderness in the affected area. If left untreated, Achilles tendinitis can lead to more serious injuries, such as a ruptured tendon, so it is important to seek medical attention if you suspect you may be suffering from this condition.