URI/Upper Respiratory Infection Question

I think you usually have to worry when there is crust or liquid running. I think it is probably normal to have some liquid inside the nose so it doesn't dry out. Just watch the eyes and nose to see if they start crusting up more. Also you could weigh daily to make sure.

Do you hear a sound like he/she has nasal or chest congestion? Is so, I would be concerned about a URI and would take your pig to the vet.

A runny nose and excessive sneezing would warrant a vet visit.