What causes a blocked nose

A blocked nose can be caused by a variety of factors. The most common causes include allergies, colds, flu, sinus infections, and environmental factors. Allergies can cause the nasal passages to become inflamed and swollen, leading to a blocked nose. Common allergens include dust, pollen, pet dander, and other airborne particles. Colds and flu are viral infections that can cause nasal congestion. The virus causes inflammation in the nasal passages, leading to a blockage of the sinuses and airways. Sinus infections, which are caused by a bacterial infection, can also cause a blocked nose. Sinuses are air-filled spaces in the bones around the nose and eyes that become infected and swollen. Environmental factors such as dry air, high levels of pollutants, and chemical fumes can also cause nasal irritation and congestion. If you have a blocked nose, it is important to identify the underlying cause so that you can seek appropriate treatment. If the blockage persists or is accompanied by other symptoms such as fever or loss of taste or smell, it is recommended to consult a doctor for further evaluation and treatment.