There are several causes of sudden shivering: 1. Patients with high fever, commonly seen in toxic bacterial dysentery, acute purulent cholecystitis, acute pyelonephritis, etc. In addition to shivering there is also an increase in body temperature as well as abdominal pain, nausea, vomiting and other symptoms. The diagnosis can be clarified by completing routine stool, blood, urine and abdominal ultrasound tests, and the shivering will improve after anti-inflammatory and antipyretic treatment. 2, nervousness and frightened, angry, etc., commonly found in young women when frightened or nervous, angry, there will be a sudden shivering of the whole body, with the upper limbs shaking as obvious. Generally, after resting and calming down, it can improve on its own for a short time, but it is easy to recur. 3, brain diseases are mostly seen in the elderly, such as acute cerebral infarction, cerebral hemorrhage, etc., which damage the extrapyramidal system and cause uncontrollable and sudden involuntary movements, manifesting as whole-body shaking, and can be clearly diagnosed by cranial CT or cranial MRI.