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When to see a doctor. Arrhythmias may cause you to feel premature or extra heartbeats, or you may feel that your heart is racing or beating too slowly. Other signs and symptoms may be related to your heart not pumping effectively due to the fast or slow heartbeat. These include shortness of breath, weakness, dizziness, lightheadedness, fainting or near fainting, and chest pain or discomfort.
Cancer is the most common cause of the syndrome of inappropriate antidiuretic hormone (SIADH), with small cell lung cancer (A) being the most common cancer that increases ADH, which causes dilutional hyponatremia and fluid retention. (B, C, and D) are also possible causes, but secondary to CNS trauma or disease.