Calf muscle strain with hard lumps generally consider hematoma, healing scar, calf vein thrombosis and other reasons. 1. After the calf muscle strain, the local bleeding and oozing, with the extension of time, hematoma gradually mechanized, so there will be hard lumps, through the hot compresses, wax therapy, ultrashort wave physiotherapy gradually can subside. 2. After calf muscle strain, muscle tear, tissue healing process of fibrous connective tissue will form a scar, there will be local hard lumps, some will have pain when pressed, this generally do not need special treatment, scar tissue will gradually become soft. 3. After calf strain due to braking rest, lower limb blood return slow, easy to form calf vein thrombosis, localized swelling. Calf muscle strain localized hard lumps go to the hospital, check the clear diagnosis before further processing.