Increasing the humidity in the air with a vaporizer or humidifier helps thin or liquefy the mucus. Heated air inside a house is usually very dry -- cooler air contains more moisture, and is preferable.
Keeping the mucus thin (rather than thick and sticky) will help prevent complications, such as ear and sinus infections, and will help prevent plugging of the nasal passages. One way to do this is by using saline nasal sprays.
Drinking extra fluids also helps to thin nasal secretions.
Because of the complications of medications, runny noses should be treated only when the discomfort is moderate to extreme.
Antihistamines (to block allergic reactions and decrease the amount of secretion), decongestants (to shrink the mucus membranes), analgesics, or antipyretics can provide some relief.
Don't use over-the-counter nasal sprays more frequently than 3 days on and 3 days off, unless ordered by the doctor.
Be aware that decongestants make some children overly active, and that antihistamines may cause drowsiness, as well as interfere with sleep.
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