Radon comes from the radioactive breakdown of naturally occurring radium found in most Florida soils, and in most earthen material used in the building process. In the vast majority of buildings with radon problems, the largest source of radon is soil gas entering the building through small openings in the foundation.
Symptoms of nasal cavity cancer and paranasal sinus cancer include chronic congestion, recurring infections of the sinuses, headaches and recurring nosebleeds, according to Cancer.net.
Lumps in the Nose or Mouth. As the nose cancer progresses, the cancer cells begin to form larger tumors within the nasal cavity. As a result, nose cancer patients may notice the formation of lumps within the nasal cavity, corresponding to abnormal growths in the lining of the sinuses. The American Cancer Society also notes that nose cancer may cause abnormal growths on the face or on the palette---the roof of the mouth.