Brief Answer: Electrical system of the heart malfunctioning. Detailed Answer: Hello, thank you for posting your question. I read carefully your concern. Irregular heart beat ,or arrythmia, is a common condition, that affects a lot of people. Thale causes of yhat may be very different including:a malfunctionof the electrical system of the heart, a dysfunction of Thyroid gland, which prosuces inadeguade hormones levels, also a disbalance of electorlytes in the blood, especially Potassium levels, stress and emotions also affects. the heart beat. Last id suggest stimulants beverages like coffie or energy drinks. This are the mos common causes of irregular heart beat. I would suggest to perform an examination Called Holter ECG, which records and monitor your heart rrythem for 24 hours. In this way the doctor can check if you have permanent or episodic arrythmia. Also you should take a blood test to check you thyroid hormonal levels and electorlytes in the blood. If the hormonal lab tests show a malfunction of tbe thyroid gland, it is neccessary to consult an Endocrinologyst, to treat the underlying problem. If you have disbalanced electrolytes levels you should take Electrolytes IV and eat a diet that is rich in minerals like potassium. Please feel free to ask any further questions. Best regards!