hey, idk if this is what u were asking (i dont have quiet bpd myself) but Im pretty sure the difference is one is like.. quiet bpd is inward. like they dont look/act like they have bpd? thats how ive heard it described at least. so "loud" bpd would be like, bpd but you very much behave like it

I don't have quiet BPD, but I looked it up and found this: "Whereas the typical presentation of BPD involves angry outbursts and obvious and outward self destructiveness, those with quiet BPD have internalized emotional episodes2 (they turn their anger inward). For this reason, quiet BPD tends to go undiagnosed or is misdiagnosed."

There are four sub-types of bpd. Quiet bpd is known to internalize everything. We implode vs always exploding. Everything is directed inward! But there are three other types.

I have quite BPD now but before 5 yrs ago i had loud BPD i dont know why i changed it

I have quiet bpd but I used to have self-destructive bpd. basically I just internalize all of my emotions and self-blame a loooot. even though it appears that I’m “high functioning”, oftentimes I’m going crazy in my head

I think i have quiet bpd im more inward