Allergies CAN cause a sinus infection.
More Info: The sinuses are lined with mucous membranes and cilia, which help to move mucous from the sinuses. When too much mucous fills the cavity it can cause a buildup of bacteria which can lead to a sinus infection. Allergens and pollutants have the potential to cause this mucous buildup
Where Are the Sinuses Located?
The sinuses are located on the facial side of the skull. Humans have 4 pairs of void, air-filled sinus cavities. The frontal sinuses are located on the forehead. Maxillary sinuses are located behind the cheekbones. Ethmoid sinuses are located between the eyes whereas sphenoid sinuses are behind the eyes. All of the sinuses contain a mucous-like lining and tiny hairs called cilia that try and keep the various particles and bacteria floating around outside of the body. When the sinuses are working to fight off the bacterium it leads to symptoms of a Sinus Infection.
What Are the Types of Sinus Infections?
Sinus infections, sometimes called sinusitis, are of two types:
Acute sinus infections most often are the aftermath of an upper respiratory tract infection inflaming the cells lining the sinus. The thick secretions so characteristic of sinus infections are largely comprised of white blood cells, mobilizing as part of the inflammatory response. Airborne allergens and pollutants can also trigger acute sinus infections. Acute sinus infections often resolve on their own; in some cases where they're caused by bacteria, they may be treated with antibiotics.
Chronic sinus infections are infections that last for 12 weeks or longer, often defying treatment attempts. Abnormal anatomical structures, like nasal polyps or a deviated septum, act to "trap" the infection.