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It is not likely from Hiatus Hernia
/ Alcohol / Tobacco (smoking, chewing) / Caffeine (too much coffee, cola) are common causes.
Medicines may be responsible – like Phenylephrine
used for ‘cold’ / Salbutamol
used for asthma and so on.
Illicit ‘drugs’ like Amphetamine
are notorious to cause abnormal beats
At times, abnormal nerve paths in the heart (bypass tracts) are responsible!
If the problem is 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.
Wishing speedy recovery