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What Causes Sinus Infection Ever wondered what really causes a sinus infection? There are many possibilities and it is sometimes hard to pinpoint which one is the culprit. You could have gotten it while you are at work, out in the mall, doing a certain activity or even at home so here are some of the known causes of sinus infections. Most sinus infections are caused by the common cold otherwise known as viral influenza. This causes congestion in the nasal passages and inhibits the drainage of the sinuses which is why it becomes inflamed. When this happens, the nose is filled with mucus caused by the accumulation of white blood cells in the lining of the nose. This makes it difficult for the person to smell or even breathe and the only way to get rid of it is to blow it out. Generally a common flu stays a maximum for a period of one week. After that we usually recover, but it leaves our sinuses inflamed. The nose is a very sensitive part of our body which catches a viral infection very easily. Sinus infection can also be caused by exposure to dust particles, pollen and other irritants in the air. If there is too much of this already in the nasal passages, it prevents mucus from draining away. When these bacteria such as streptococcus pneumoniae and haemophilus influenzae end up in our upper respiratory tract and multiply, then it causes us to have a sinus infection. You can come into contact with these every time you go outdoors or when you are inside the house especially in places where natural sunlight cannot reach. Another example is the fungus known as aspergillus that can cause problems to the immune system. If you have asthma, you are a high risk for sinus infections because your nasal polyps inside your nose are swollen. This results in chronic sinus infections that could last for 2 weeks. Lack of water also causes a sinus infection. This is because the mucus will thicken making it difficult for the cilia to move it through the sinuses. Sinus infections can also happen whenever we are stressed. To prove the point, one such condition known as vasomotor rhinitis shows that stress does cause excessive swelling and mucus production. You can also get a sinus infection by blowing your nose too much. This is because your nose will swell after blowing it too hard or too much. Certain activities that are fun can also cause sinus infection. Traveling by air and scuba diving are very common because to much pressure in the sinuses causes bacteria to grow. If you don’t watch your kids carefully, they may inhale harmful substances or other foreign objects that introduce bacteria into the sinuses. Certain medications are also known to cause sinus infections as a side effect because it may affect the functioning of the mucus membrane. Lastly, although very rare, you can get a sinus infection from disease teeth because the maxillary sinus in the cheekbone becomes infected by the root of a diseased upper tooth. There are many causes of sinus infections and it is not only bacterial or viral. Now that you know what these are, it is time for you to take steps to prevent this from happening.