What does a heart murmur feel like?

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Every now and then I get a strange sensation round and in my heart like it's vibrating or in a spasm or something. It only lasts a second and by time I take my pulse it feels normal. It doesn't hurt and I don't have any other symptoms.

What could this be and should I be worried?
I have been under a lot of stress recently, on top of my 'normal' high stress level...

I don't think you can feel a murmour, you can hear it though. It's possibly an arhythmia, I get this, it's caused by an extra beat, then a short gap while it catches up with itself. It's not dangerous, I would go and see the GP though so they can diagnose it.

Definitely getting worth checked out - I have just been diagnosed with long qt syndrome which is a longer spell between the charging part of the heart and it feels like this. An ECG can sometimes pick this up but not always. Mine had to be diagnosed with a genetic blood test - 3 months for results!! any history in the family?
Lots of these are harmless enough but not all.
Don't want to worry you just want to share advice. x

Thanks, no family history afaik, I will get it checked out...