I have lactose intolerance, sometimes i have diarrhea, in some episodes of this diarrhea i have tachycardia, is it normal? dont have heart problems

Maybe: Diarrhea is common if you are consuming lactose in spite of your known intolerance.It is also common as a physical sign in Irritable Bowel Syndrome or with incidental viral gut infections. You should expect tachycardia if you are loosing fluid volume with diarrhea or have a viral infection. You would not necessarily have tachycardia if you just had a single loose stool.