what causes TN physically? (see text)

What causes TN when you develop TN as a result of the veins/arteries rubbing up against the trigeminal nerve and removing the myelin sheath?

obviously the vessels weren't always there if you developed it later in life (right?)

do they just grow and develop later? (is that a thing?)

what causes it to happen?

I've been diagnosed with TN since june 2020 and had 3 MVDs 1 gamma knife and realized no one has actually explained to me how it actually happens.

someone told me that their relative got dx with TN and their doctor told them it was caused by stress. I think TN might by exasterbated by it but I have a hard time believing it's caused by it.