The severity of positive fecal occult blood in children is mainly related to the specific cause of the disease. Positive fecal occult blood caused by allergies is usually not particularly serious, while bleeding caused by gastrointestinal diseases is more serious. 1. Not serious: Common allergies such as lactose intolerance or milk protein allergy can also lead to positive fecal occult blood in children. In this case, as long as you change lactose-free milk powder or actively avoid allergens, you can avoid the occurrence of positive fecal occult blood. 2. Serious: positive fecal occult blood often indicates the presence of gastrointestinal bleeding, gastrointestinal diseases such as gastric ulcers, duodenal ulcers, etc., can lead to gastrointestinal bleeding, the above situation if not resolved for a long period of time, it is easy to affect the normal life of the situation is more serious. It is recommended that children with positive fecal occult blood should consult a doctor in time to find out the specific cause of the disease, and actively according to the doctor’s instructions for treatment, so as not to delay the condition.