I believe our alters can have any number of differet conditions that we may not have ourselves as the core personality, I think my belief in the impossible relating to DID came when I say on one Youtube clip how a woman was legally blind but when her psych was communicatng with a fw of her alters that were clearly able to see.

I've heard of stuff like that before, too....one of my therapists told me a few different times, that she once knew a person who was diabetic and couldn't keep her blood sugar level down, but if her dr. could talk her into switching, then her blood sugar would change. I always take that stuff with a grain of salt, though, because there can sometimes be things we might not know to consider...for instance, the person my therapist knew...perhaps said person had indeed switched, but the BS level may have gotten lower the next time it was checked anyway just because a good enough span of time occured between checks that allowed the BS level to lower on its own anyway. Another one I've heard frequently is that a person's eye color can change, too.

Now, I am not trying to say I think none of this could possibly happen, but that there could be other reasons as well...for instance, different colors of clothes that you're wearing can bring out different hues of your eye color and make your eye color appear to be different. But there is some credence to the possibility of there also being an actual color change with different alters, or other kinds of changes. After knowing what goes on inside my whirlpool brain, I know anything's possible!!

Personally, I've felt punched in the ribs before -- but from the inside. Once I fell into a hypnotic trance while talking with a lay counselor. I opened up a lot to her, I think merely because she did NOT keep any written records. She did the counseling as a ministry. And she was quite good at it. But of course, it would be my luck that she stopped doing her counseling ministry and went on to doing something else a few months after I started working with her. But I was with her long enough to get a good peek inside of myself without having to worry about what was actually being written in a record. I think that in itself is a big deterrant for some people in regards to getting help. And it's well warranted, too, I think.

I do think its possible.Especially if ADHD is neurological,i would think might be a part of it.
I've had doctors notice huge changes in blood pressure readings.I've had them notice huge changes in blood sugar readings too.
Also I was tested by a disability doctor for intelligence levels(IQ) i think and the disability dr said it was below average...when my psych dr saw his results,he said " this doesnt make any sense to me,i'm sure you have above normal IQ" At this time i did not have any dissociative diagnosis.But he was pondering the changes.
So yes,i think there can definitely be physical and also mental changes with different alters.