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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.
Some of the causes of Hemihypertrophy are included in the list below: 1  Klippel-Trenaunay syndrome. 2  Neurofibromatosis type 1. 3  Russell-Silver dwarfism. 4  Melorheostosis. Wiedemann-Beckwith syndrome.