Medical officials often see a spike in heart-related emergency room visits during the Christmas holidays.

It’s a phenomenon known as Holiday Heart Syndrome and cardiovascular and heart-health expert Dr. David T. Martin of Australian Catholic University says it’s often caused by a combination of disrupted routine, stress, and overindulgence.

He says it’s also primarily caused by the effects of binge-drinking on the heart.

Dr. Martin says while the effects of alcohol are well-known, it can also affect heart function.

“One of the first signs of alcohol on the heart is the development of an abnormal heath rhythm called atrial fibrillation.” He says it includes uncomfortable palpitations, shortness of breath, dizzy spells and a generally feeling unwell. “It occurs a day, or two, or three days after an episode of binge-drinking.”

Martin recommends moderation over the holiday season.