It may you pay attention only when sick, but only one nostril you breathe is always more difficult than the other. During the day, the nostrils "change places" - the one that was more difficult to clean, and the other, on the contrary, lays. Why is this happening? Experts from the national library of medicine (US National Library of Medicine) answer.
It turns out that periodic unilateral nasal congestion is a normal physiological process that helps a person to better perceive odors and protects the inner surfaces of the nose from drying out. During the nasal cycle, the tissues around one nostril are saturated with blood (similar to the process of erection in men), which causes difficulty breathing this nostril for a period of three to six hours. Then the blood goes away,and it's the second nostrils. With smells, it works like this: some scents are better perceived, if the person inhales quickly, others very slowly, respectively, for more efficient operation of the nose nostrils should draw air at different speeds. A constant strong air flow dries the mucous membranes and helps to destroy small hairs – which eventually leads to a decrease in the protective function of the nose and an increase in the number of pathogenic microbes that enter the body through the respiratory tract.
When a person becomes ill, the feeling of being held hostage increases and causes discomfort – but, nevertheless, it is worth remembering that periodic confinement is a normal process designed to improve the quality of human life.