There is a reaction time for foreign bodies to enter the nasal cavity. Unlike adults, children usually do not complain about it and may have pus in their nasal cavity for about a week, and parents may find it themselves or go to the hospital for examination before finding out that there is a foreign body in the nasal cavity. For older children, foreign bodies entering the nasal cavity can lead to nasal foreign body sensation and sneezing, which can usually be detected and removed in time. For children with nasal foreign bodies, it is mostly due to the curiosity of children that small round objects, such as balls and toilet paper, are inserted into the nasal cavity. Parents need to keep an eye on the children so that the foreign bodies do not reach the nasopharynx through the nasal cavity and then cause tracheal foreign bodies, which can affect breathing and even lead to breathing difficulties, etc. For known foreign bodies in the nasal cavity, they need to be removed as soon as possible to reduce the damage to the nasal cavity and the infection brought by the foreign body.