Idiopathic Gastroparesis [
C]
This is a fun one. So, in the very severe cases, the virus can infect your vagus nerve causing GP. And most "idiopathic" cases are really just EV. 9 out of 10 of idiopathic cases turned up to be EV and it seems a minor subset is also caused by your lovely neighborhood friend, Norovirus. The underlying mechanism is again, infection, likely through the CNS and/or ENS. Also, keep in mind these viruses
love to travel up through the vagus nerve and use it like a highway to evade your immune system and reach places like your brain and eyes.
https://link.springer.com/article/10.1007/s10620-016-4227-x
https://pubmed.ncbi.nlm.nih.gov/27344315/
https://www.cureus.com/articles/21623-norovirus-induced-gastroparesis
Idiopathic Mast Cell Disease/Activation Syndrome [
B]