You should avoid all the environmental factors that precipitate allergic reactions such as pollen, dust, cold, and fomites (for those people who are prone to allergies).
It is also advisable to minimise contact with people with flu symptoms. The infection is mostly air-borne through droplets.
Other ways of prevention of sinusitis include: avoidance of cigarette smoke (passive smoking is associated with chronic sinusitis) and prompt treatment of acute upper respiratory infection so that they don’t progress into chronic sinusitis.
Practice good hygiene in order to avoid flu because sinusitis always starts with flu. Treat colds early enough and avoid extreme temperatures as they many interfere with the way the nose operates.
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