Separation anxiety in children occurs before the age of six years and refers to excessive anxiety when a child is separated from an attachment figure; excessive worry that the primary attachment figure may be harmed or that they will never return; fear of being separated from the primary attachment figure; reluctance or refusal to go to kindergarten or school because of fear of being separated (not because of the kindergarten or school); unwillingness or refusal to go to bed without the primary attachment figure; a persistent and inappropriate fear of being alone, fear of staying at home without the attachment figure; recurrent nightmares related to separation; excessive and recurrent distress immediately upon anticipation of separation from the attachment figure, which may be manifested by crying, temper tantrums, distress, apathy, or withdrawal; and recurrent somatic symptoms after separation in some children: nausea, vomiting, headache, stomachache, and general malaise. In separation anxiety disorder, pediatricians should view the disorder through the lens of the developmental process. Normal separation anxiety first occurs in infants between 6 and 8 months of age and disappears after 3 years of age when the pediatrician understands that separation from an attachment is temporary. Therefore, caution should be exercised in diagnosing this disorder in children before the age of 5 years, and it is not diagnosed in children before the age of 30 months. Separation anxiety disorder manifests itself in the form of deep anxiety when the child is separated from his or her loved ones, resulting in obvious anxiety, most children are often unfounded fears that their loved ones will leave them in danger or accidents, and therefore do not want to leave their loved ones, do not go to kindergarten or refuse to go to school, even if reluctantly to go to school, but also crying or struggling, and some children will also have the symptom of dysfunction of the autonomic nervous system, vomiting, abdominal pain, Headache, etc., the course of the disease lasts from several months to several years.