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.
Other symptoms are nasal congestion or stuffy nose, sore throat, cough, fever and pain of the nasal membranes. With further invasion and inflammation, the sinuses become involved which results in headache, fever, chills, pressure along the sinus cavities (forehead, below eyes).