Children’s crying may be caused by physiological factors, such as hunger, mosquito bites, etc., or pathologic factors, such as intestinal cramps, ascariasis, etc. 1. Physiological factors: younger children do not have enough to eat or mosquito bites, may feel uncomfortable, thus appearing to cry phenomenon, no other abnormal performance. Older children will also express themselves by crying when they encounter something unsatisfactory, in addition, there are some children who will cry to get what they want. 2. Pathologic factors: (1) Intestinal spasm: children can be triggered by intestinal spasm due to cold abdomen, food allergy and other factors, resulting in sudden colic in the area around the umbilicus of the child, and it will recur, leading to the child’s love of crying, accompanied by restlessness and other phenomena. (2) Ascariasis: Ascariasis may be triggered when children play with dirt or eat unclean fruits and vegetables, resulting in crying due to abdominal pain, and some of them may also suffer from night terrors and teeth grinding. In addition, other diseases such as vitamin D deficiency can also cause children to cry, it is recommended to go to the hospital in a timely manner to rule out physiological factors, and then receive treatment as soon as possible.