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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.
Causes of Hypoglycemia. Hypoglycemia is most commonly a complication of diabetes treatment (diabetic hypoglycemia). You can develop hypoglycemia by taking too much insulin or other diabetes medicines. Hypoglycemia may result from other causes, but these occur much less commonly than diabetes. Other possible causes include: 1  Medicines. 2  Some medicines used to treat conditions other than diabetes can cause hypoglycemia or hide its symptoms. 3  Too much insulin.