What is the connection between heart palpitations and sweating?

Distress. Simple palpitations do not cause sweating and sweating does not cause palpitations. If you have so severe a spell that you almost pass out or do actually pass out, you may very well become sweaty.
Various ways. If palpitations are caused by anxiety, or result in anxiety, the adrenaline rush can can sweating. This can be true also if they are due to systemic disease such as hyperthyroidism.

Related Questions

Had Lyme 3 years ago and was treated with 28 days of rocephron. Sometimes I awake with heart palpitations and sweating. 65 female, everything checksok?

Lyme disease. If you were treated as you describe for acute lyme disease then it is not likely that your current issues are related to that prior infection. Without knowing what you mean by "palpitation" or "checks out ok" cannot comment further, but hopefully you have been seen by a cardiologist. Good luck. Read more...

(6 months) occasional tightness in my chest and heart palpitations. One week ago I had a strong palpitation and started sweating. Is this dangerous?

PALPITATIONS W/U. Palpitations that symptomatic deserve a prompt W/U: exam/labs especially TFTS/EKG/Event Monitor/ECHO andThe discussion of treatment options with your doctor. While you are waiting eliminate caffeine focus on staying hydrated. If palpitations worsen or syncope develops go directly to the ER stick to a GF diet WholeApproach.com gutbliss.com. MAGINEX/INDERAL/VERAPAMIL can be effective. Read more...

When you look up MRI risks and it says breathing difficulties, sweating, numbness, or heart palpitations is that risk from contrast or mri?

There is . Not known side effect of MRI scan. Symptoms you refered could be contrast induced or a claustrophobic/anxiety attack. Not all MRI need contrast. Metal devices can go in the scanner. Piercing or medical devices. Read more...
MRI. There are no medical problems or side effects from getting an mri. You are describing symptoms that come from either claustrophobia or anxiety. It is rare that 'contrast' is used during mris. Read more...