Sudden soreness in the calf muscles is commonly caused by the following: 1. Acute injury, due to the acute onset of injury, so it can cause sudden soreness in the calf muscles. It is common in the calf muscle strains, contusions, bruises and so on, which leads to muscle fiber bleeding, congestion, edema, inflammatory reaction, will stimulate the corresponding soreness symptoms. 2, seen in the calf local muscle suddenly appear blood circulation disorders, such as patients have previous varicose veins, phlebitis, suddenly produce blood clots or due to the calf muscle local cold, resulting in vasoconstriction, appearing The patient’s previous atherosclerosis, hypertension, diabetes, etc., will also cause local neuritis and vasculitis, leading to the sudden appearance of soreness.