Heart palpitations can be triggered by stress, exercise, medication or, rarely, a medical condition. Although heart palpitations can be worrisome, they're usually harmless. In rare cases, heart palpitations can be a symptom of a more serious heart condition, such as an irregular heartbeat (arrhythmia), that may require treatment. Symptoms.
Long-term exposure to radon can lead to lung cancer, the only cancer proven to be associated with inhaling radon. There has been a suggestion of increased risk of leukemia associated with radon exposure in adults and children; however, the evidence is not conclusive.
1 Radon causes about 21,000 lung cancer deaths each year in the U.S. 2  Radon is produced from the natural breakdown of uranium in soil, rock and water. 3  Radon is found all over the U.S. It can be detected in any type of building-homes, offices, and schools. 4  It is impossible to smell or taste radon.