Function

When you are having an allergic reaction, your body releases the chemical, histamine. Your body can react to histamine in a variety of ways, one of them being an itchy nose.

Significance

When you have a common cold, your body will produce more mucus as a reaction to the virus. The excess mucus and snot can cause your nose to itch.

Features

An itchy nose is also usually the first sign of a common cold. Since you cannot cure a virus, you can try to lessen the symptoms by using a neti pot. A neti pot is a small tea-shaped device that you fill with water. You then inhale the water through one nostril and expel it from the other. Neti pots work by irrigating the nasal passages and flushing out any irritants or dirt that happen to be stuck in there.

Considerations

Your itchy nose can also be a reaction to a new chemical introduced in a household cleaning or beauty product. If you have recently begun using something new, discontinue its use and see if your itchy nose clears up.

Prevention/Solution

An itchy nose can also be a reaction to a dry environment. If you live or work in a dry place, try using a humidifier to remedy the situation.

Source:

seattlepi.com: Ask The Mayo Clinic: Many causes for persistent nasal drip

healingdaily.com: Neti Pot for Sinus Health