Zinc deficiency, or zinc deficiency, is a disease caused by a lack of zinc in the body due to various reasons. Zinc is one of the essential trace elements of the human body and is widely involved in various metabolic activities as a component of many enzymes. The clinical manifestations of zinc deficiency in children are mostly physiological disorders: slow growth, lagging behind peers, and short stature. Unexplained anorexia, decreased appetite. Overeating: biting fingernails, eating paper, eating dirt, eating cinders, etc. Various rashes: persistent eczema. Recurrent mouth ulcers, or peeling of the tongue mucosa piece by piece on the tongue, which peels off in a map-like shape. Baldness. Mental lethargy, drowsiness, and easy fatigue. Delayed sexual development: incomplete development of secondary sexual characteristics, low immunity, susceptibility to various infections: recurrent colds or diarrhea; poor wound healing in case of trauma. Hyperactivity, slow reaction, inattention, unstable academic performance, poor learning ability. The child’s mood swings are high. White spots appear on the child’s nails, and barbs appear on the skin around the nails. Decreased vision, difficulty in night vision, nearsightedness, farsightedness, cloudy cornea. Therefore, when a child shows the above symptoms, such as finding that the child does not like to eat for a longer period of time, it is recommended to go to a regular hospital in time to check whether there is zinc deficiency, and if zinc deficiency is diagnosed, one should follow the doctor’s advice and treat it in time.