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.
A: Some of the symptoms of radon gas exposure include a persistent cough that does not improve, coughing up blood, hoarseness, difficulty breathing, and wheezing. Resembling lung cancer, chest pains and recurring bronchitis or pneumonia are other signs of radon exposure, according to National Radon Defense.