Dr. Travis Stork explains that the stuffy feeling you have in your nose is due to inflamed blood vessels. He says the problem occurs when someone blows too forcefully and notes that blowing the nose too hard can further irritate the area and mucous can actually be blown back up into the nose -- which is not ideal.
Instead of a powerful blow, The Doctors suggest closing one side of the nose with your finger and then gently blowing through the open nostril, and then repeating the technique on the other side. Dr. Travis says this will helps to reduce irritation when you're congested.
Dr. Travis also suggests using a saline nose solution in the morning and night when battling a cold.