Dryness in the nose can not rub fish oil. Fish oil, known as fish oil fat emulsion, is extracted from marine fish fat; it is used to supplement patients with long-chain omega-3 fatty acids, eicosapentaenoic acid, and docosahexaenoic acid, when oral or enteral nutrition is not possible, is not functional, or is contraindicated. Fish oil is an injectable emulsion and should not be used to treat dry nose. Dryness in the nose may be caused by physiological factors such as environmental stimulation, or pathologic factors such as upper respiratory tract infection, dry rhinitis, allergic rhinitis, etc. It can be relieved by general treatment and medication. 1. General treatment: Nasal dryness caused by physiological factors does not require too much intervention, and can be relieved by drinking more water, eating more fruits and vegetables, and maintaining the humidity of the environment. Pathological dryness can be relieved by using 5% glucose saline drops or rinsing the nasal cavity with saline. 2. Drug treatment: the nose dryness caused by pathologic factors, the serious need to use drugs. For example, apply gentamycin or erythromycin ointment to inhibit bacterial growth, moisturize the nasal mucosa and promote wound repair. Oral vitamin A, vitamin B, vitamin C, etc., to promote the metabolism of epithelial cells, enhance mucosal resistance. All of the above drugs should be used under the guidance of a doctor. If the symptoms cannot be relieved after physiological factors are excluded, it is necessary to consult a doctor in time for targeted treatment.