My therapist said I have both and I’ve heard I have both for years from other professionals. Trying to understand my brain better but sometimes it’s hard to untangle the two things and understand the origin of some of my tendencies. Like am I impulsive because of BPD, ADHD, or both? 
Didn’t know how common it was to have both and was curious.
Also curious if my untreated ADHD created my BPD after trauma and stuff in childhood (therapist said my BPD was starting at 12yo). Just really curious and trying to understand what’s going on and wanted to hear others discuss it.