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.
What it is, how it affects us, why it matters. Radon Fact Sheet. The U.S. Environmental Protection Agency (US EPA) and the Surgeon Generalâs Office have estimated that as many as 20,000 lung cancer deaths are caused each year by radon.