Answer:
Sinus infections happen when fluid builds up in the air-filled pockets in the face (sinuses), which allows germs to grow. Viruses cause most sinus infections, but bacteria can cause some sinus infections.
Explanation:
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Um, i think probably so... it depends on if the doctor fully healed it or not...
The immune system protects the body from infections and other external objects, whereas the circulatory system gives the body vital nutrition and resources. These two systems complement one another like peanut butter and jelly; they are each excellent on their own, but when combined, they create something truly remarkable.