Hi:
Kudos for qutting the cigs.
As applicable, the most common type of palpitations, premature ventricular contractions (PVCs, occurs even in many heart-healthy individuals), described that the heart is flip-flopping, fluttering, jumping, pausing or stopping briefly (though it's actually not doing that), pounding, skipping, thumping, or strong, hard, or forceful beats being felt in the chest, neck, throat, has various causes (cardiac and non-cardiac, which includes anxiety and stress) or triggers.
PVCs are typically harmless (benign), be it isolated (single), couplets (2-in-row), triplets (3-in-a-row) or salvos (short bursts of 3 or more in-a-row), bigeminy (occurring every other beat), trigeminy (occurring every third beat), quadrigeminy (occurring every fourth beat), etc., etc.
As applicable, some individuals have reported, palpitations being triggered off by GERD/acid reflux/heartburn, swallowing (food or drink), gas, bloating, belching, burping, or coughing, or after a heavy meal/on a full stomach.
These are known as indirect causes or an "reactive-arrhythmia". This may/can also be a side effect of some foods (which includes additives and preservatives), drinks, or drugs. On the flip side, in some cases, belching, burping, or coughing may/can terminate/relieve an irregular heartbeat.
Noteworthy, in some individuals, as applicable, more so if there is a bounding, firm, or strong pulse (for whatever reason, constant or briefly), they can see a rhythmic pulsing or throbbing (in-sync with the heartbeat) in a vein, such as in the hand, arm, or neck, simply because of their body habitus, e.g., thin or thin 'n tall build (or so-called being "thin-skinned") and physique. A pulsing in the chest,
and sometimes in the abdomen/stomach, may/can be felt and noticed as well, especially when lying down.Additionally, of the different types/kinds of heart conditions, various symptoms may/can be acute (occurring suddenly), be chronic (occurring over a long period of time), come and go (be transient, fleeting or episodic) or even be silent.
Best of luck down the road of life. Live long and prosper.
Take care,
CardioStar*
WebMD member (since 8/99)
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Palpitations (PACs, PVCs)http://www.medicinenet.com/Palpitations/article.htm eHealthMD
Palpitationshttp://www.ehealthmd.com/library/palpitations/PAL_whatis.html WebMD
Heart Disease TYPESAcquired in life or congenital (born with it) http://www.webmd.com/heart-disease/heart-disease-men Heart Disease SYMPTOMShttp://www.webmd.com/heart-disease/guide/heart-disease-symptoms Mayo Clinic
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Heart disease is a broad term used to describe a range of diseases that affect your heart, and in some cases, your blood vessels. The various diseases that fall under the umbrella of......
http://www.mayoclinic.com/health/heart-disease/DS01120 Learn About the

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The Heart: (Human Anatomy) Pictures, Definition, Location in the Body and Heart Problems
http://www.webmd.com/heart/picture-of-the-heart How the Heart Pumps
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http://your-doctor.com/healthinfocenter/medical-conditions/cardiovascular/heartpump-tutorial.html HeartSiteHeart info, cardiac tests (commonly performed, mainstream types) info, actual diagnostic images.
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