Fish oil, cannot be used directly in the nasal passages. In the case of cod liver oil nasal drops can be dropped into the nasal cavity for nasal bleeding, nasal dryness, and even nasal mucosal erosion. Fish oil, which is used for the treatment of hypertriglyceridemia, is an oral treatment and cannot be dripped into the nasal cavity. Cod liver oil drops into the nasal cavity can play a mucosal moisturizing, protective effect, mostly used in dry rhinitis and atrophic rhinitis treatment, cod liver oil drops into the nasal cavity through the mucosal absorption, often can be used safely. Cod liver oil drops into the nasal cavity through the mucous membrane absorption, often can be used safely. Cod liver oil drops into the nasal cavity generally do not appear obvious side effects. It is not clear whether long-term nasal drops have side effects. Therefore, it is recommended to apply under the guidance of a physician to avoid causing adverse reactions.