Hi Thanks for posting on HCM Palpitation could be caused by many medical conditions.Some possible causes may include: -Ionic imbalances -Heart problems -Strong emotional responses, such as stress or anxiety -Strenuous exercise -Caffeine -Nicotine -Fever -Hormone changes associated with menstruation, pregnancy or menopause Unless the exact cause is identified, treatment can be very difficult.Treatment entails correcting the underlying cause. I will suggest you see the Doctor for more investigation if the problem happens again.Tests like serum electrolytes will be very useful. I will advise you try the following: *Reduce stress or anxiety *Avoid stimulants like caffeine, nicotine, some cold medicines and energy drinks, can make your heart beat quickly or irregularly. *Avoid illegal drugs like cocaine and amphetamines.. *Have you BP checked Hope this will help Best regards