Hello, I had gone through your query and understand your concern. Short answer: Low potassium level causes palpitations. Detailed answer: Thanks for asking on HCM. Low potassium level in the body is known to cause abnormal heart rythm. This is the cause for your palpitations. Low potassium lever is may be due to 01) Low intake in the diet 02) Loss of potassium because of diarrhea or excessive sweating 03) loss through urine when on diuretics 04) Hormonal imbalance Treatment depends on the severity. If it is mild you will be put on oral potassium supplements. if it is severe then you may need intra venous correction of potassium level. Once the potassium level is corrected your palpitations will go away. Tender coconut, ripe banana are good dietary source of potassium. Hope this helps. If you have any other query, feel free to ask. regards, dr.prathap kumar