 [ Symptoms ] i was hiy by a car when i was 7 why is one calf growing bigger than the other [ Disease ] hi the old injury may have cause damage to the veins in the leg causing blockage of venous blood drainage causing the calf to swell other possibility is that a deep vein thrombosis may have occured recently which can occur spontaneously without any reason get venous doppler study of that limb done to confirm thanks