It is difficult to keep ethmoiditis from spreading. However, clearing nasal secretions may help prevent bacterial infections. Nasal clearing can be done by drinking lots of liquids, limiting milk, and rinsing out the sinuses with salt water. In the case of allergies, a person should avoid the things that cause allergic reactions. If there is chronic inflammation or infection, steroid nasal spray can help prevent some of the damage to mucous membranes that can occur over time.
If there is long-term allergic, bacterial, or structural involvement, the lining of the sinuses can thicken and block drainage. This can lead to chronic sinusitis.
Ethmoiditis is not contagious.