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This question already has an answer here:

If someone is under stress, he or she may feel a strange feeling in the belly; it can be said that he or she feels that butterflies spread through the belly.

For other emotional reactions like being in love, similar, but different feelings can be caused.

What causes this symptoms? Is it because of the muscle tension varies, is it an electric current through the nerves?

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marked as duplicate by Rory M, Bryan Krause♦, David, kmm, user24284 Jun 4 '17 at 8:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ "Butterflies" are caused by adrenaline (or nor-epinephrine) released by stress. It is one of the first stress hormones released. Love is a bit different. This question is very broad, and you can easily google part of it and show your research. If you narrow this down, and add your research, I'd be happy to withdraw mt close vote. $\endgroup$ – anongoodnurse Feb 26 '17 at 17:45
  • $\begingroup$ Why we can feel the adrenalin or nor-epinephrine release? $\endgroup$ – kryomaxim Feb 26 '17 at 17:50
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    $\begingroup$ Do some research. I wasn't writing for nothing. $\endgroup$ – anongoodnurse Feb 26 '17 at 17:56
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These sorts of behaviors are mediated through activation of the sympathetic pathway of the autonomic nervous system.

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  • $\begingroup$ it would greatly strengthen your answer if you could expand it a bit...FYI $\endgroup$ – Vance L Albaugh Apr 24 '17 at 22:06

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