A common injury in the calf muscle is a tear of the muscle fiber at the junction of the Achilles tendon and the muscle belly. The medial head of the gastrocnemius muscle is more common than the lateral head, with partial muscle fiber tears predominating. Injuries can occur during intense strenuous activity, sudden stretching of the tendon when slipping on the floor while walking, or even sudden onset during normal activity. Achilles tendon injuries are more common in young patients with muscle injuries, while tendon injuries predominate in those over 35 years of age. The onset is sudden and can be localized pain and swelling without any trigger. Ecchymosis may appear on the lower calf after a few days. The heel is painful when stepping on the ground, but can barely walk. There is localized pressure pain, which is relieved by rest. Treatment is based on adhesive tape immobilization, heel padding and closure of the painful spot after the acute phase, supplemented by physical therapy to accelerate healing. If a large muscle or tendon rupture occurs, surgery is often required. Anastomosis of the severed end can be done, and the muscle sheath should be included if the situation permits.