Hi friend, Welcome to Health Care Magic It is very difficult to find the cause in many problems - the approach is costly, cumbersome, not cost effective and poor success rate. A typical case is increased blood pressure. Treatment may often be easy and safe. You may need several investigations - ECHOcardiogram is necessary to see the heart valves (Mitral Valve Prolapse) / heart muscle (Cardiomyopathy) and heart function (Ejection fraction, wall motion abnormality). TMT (Treadmill exercise ECG) is done to exclude Ischemia (reduced blood flow). LABORATORY work-up is routine - like blood counts, sugar, urea, electrolytes (potassium in particular), thyroid (over-active) and so on. If there are no clues and if the problem is still bothering to the extent of interfering with life style, there are advanced techniques of investigations of increasing complexity – Electro Physiological Studies (EPS) it resembles angio – a catheter is put inside the heart / electrical activity recorded / stimulation and suppression tests are carried out / suitable medicine tested and so on. Though the test is the gold standard, it is INVASIVE and has a risk (though minimal) and is not generally done unless there are compelling indications. This super-speciality expert is called ELECTRO-PHYSIOLOGIST. The treating doctor may suggest them depending on need, based on his assessment of the situation. Discuss with him and plan for further approach Take care Wishing speedy recovery God bless Good luck