It's not unusual to have the parasympathetic response of a runny nose associated with digestion. It could also be associated with some other biological factors perhaps exacerbated by the surgery. It would be hard to diagnose, I would think. I will get a runny nose if I eat a bit more than I should, just a bite or two too much will do it.
I am 12 years post op gastric bypass surgery. After the surgery I started having and continue to have constant runny nose. It is embarrassing! At times I lean over and it pours out. It is also happens when I overeat.
Has anyone had this symptom? If so have you found a solution?