Diarrhea after eating Ramen soup?

I just ate Ramen soup and I don't know why I added lemon. (Some of you may think It's gross but I love it!) It was not my first time doing it.....About 20 minutes after I waas done I got a really bad case of diarrhea I'm not the type of person that gets it very often ( last time was probably like 8 or 10 months ago >.<) So yea why did that happen? I also heard that Ramen soup is bad for you is it true?