Children with red tongue and phlegm in the throat are firstly considered to be caused by physiological factors, such as high ambient temperature, eating irritating food, etc., and also include pathological factors, such as upper respiratory tract infection or pneumonia. It is necessary to consult a doctor as soon as possible, and implement symptomatic treatment as soon as possible after a clear diagnosis. 1. Physiological factors: The symptoms are caused by eating spicy and irritating food or living in a hot environment for a long time, which makes it too late for the child to swallow the saliva. It is recommended to adjust the environment, improve the dietary structure and eliminate the triggering factors. 2. Pathologic factors: the child is infected by bacteria or viruses, resulting in infection foci in the upper respiratory tract or lungs, inducing the above symptoms. It is recommended to follow the doctor’s instructions to give anti-infection treatment to promote early recovery. It is recommended that the child should maintain a light diet, adjust the living environment, and exercise properly during the treatment period, which can help improve the resistance and improve the above symptoms.