Could my friend have a parasite or what could be wrong?

Question

we are in peru, he just woke up and had to go to the bathroom, he said that when he went it came out all liquid and felt like needles, then he went back to bed but says he really needs to go again but doesn´t want to because it hurts. He thinks that it could be from some carrot juice he drank today.

Answer 1

If he can see a doctor I would highly recommend it.  In the meantime something like immodium may be in order.  

Answer 2

Sounds like what is often referred as the GI blues.  A GI got it from  drinking water that he was not used to, or possibly contaminated.