Infant crying is a common phenomenon in daily life of infants and children, generally divided into physiological crying and pathological crying. The former does not require special treatment, while the latter is treated symptomatically for the condition. Therefore, the symptoms caused by different reasons are handled differently. Due to the immaturity of the nerve center of the brain and the incomplete development of the language center, infants can only cry to express their needs and external concerns. In addition, normal physiological crying can be caused by abnormal wet diapers, hot and tight clothing, high room temperature or discomfort caused by contact with foreign objects, etc. It does not require special treatment. Pathological crying is mostly seen in the external manifestation of discomfort caused by systemic diseases, such as fever and mouth sores caused by common respiratory system infections; diarrhea and vomiting caused by digestive system diseases; urinary system diseases leading to urinary discomfort; central nervous system infections and dermatological diseases, etc. can all lead to physical discomfort causing crying. In addition, micronutrient deficiencies such as calcium deficiency can also cause, these cases need to visit the hospital to check the relevant diseases, to clarify the cause, the specific treatment, generally can be very good improvement. In short, if there are complications, it is recommended to go to the hospital to clarify the cause and guide the treatment.