A cold is caused by direct contact with someone who already has a cold. Over the years we are all exposed to many colds and develop some immunity to them. A humidifier prevents dry mucous membranes, which may be more susceptible to infections. Vitamin C, unfortunately, has not been shown to prevent or shorten colds. Common mistakes in treating colds Most nonprescription cold remedies or tablets are worthless.
Nothing can make a cold last a shorter time.
Especially avoid drugs that have several ingredients because there is a greater chance of side effects from these drugs. Use acetaminophen for a cold only if you also have a fever, sore throat, or muscle aches. Do not take leftover antibiotics for uncomplicated colds because they have no effect on viruses and may be harmful. The nasal discharge lasts more than 10 days. Your eyes develop a yellow discharge.