Increased muscle tone in the back can generally be considered from two aspects: first, the nutritional deficiency; second, the neurological factors that lead to increased muscle tone. In terms of nutritional deficiency, the main reason is calcium deficiency, especially in infancy when there is nocturnal crying, nocturnal cries, and cramps, accompanied by increased muscle tone in the back, which may be caused by calcium deficiency with vitamin D deficiency. There are also neurological causes, and neurological causes should be considered by looking at the development of the child’s head, such as whether the fontanelle of the head is closed late or early, etc. The increased muscle tone that occurs at this time may be caused by increased intracranial pressure. Of course, there are also some causes of neurological hypertonia of the back due to polio, epidemic B encephalitis, or tuberculosis. Therefore, it is important to identify the exact cause and rule out any adverse diseases based on the overall presentation of the child.