Warning, this gets graphic. My great aunt has Alzheimer's and I am one of three caregivers. She has quite the disturbing bathroom habit... Every time she uses the bathroom, even if she just has to pee, she tries to disimpact herself. Meaning, she sticks a finger or two up her rectum and tries to pull the feces out. This results in a horrific mess. Feces all over her hands, her bottom, the toilet, and even the bathroom counters. Worst of all, she doesn't even really wash her hands afterwards. I've done everything I can think of. I've increased her fiber in her diet to try and make her bowel movement easier and decrease her need to disimpact. I've even tried to go in the bathroom with her and hold her hand while she uses the toilet. But now she gets very aggressive when I try to enter the bathroom with her. Is there anything else I can do? Sorry this got so graphic.
I was told that most folks with dementia will eventually have some type of bowel fixation.
I would talk with your aunt's doctor and have her checked for hemorrhoids or other physical blockage or irritation. Then discuss medication for treating the behavior and associated aggression issue.
Hope you have a quick and positive outcome. No pun intended ;-)
Have a box of gloves for yourself in the bathroom, so in case you have to wipe the "rear", you can be protected. I found baby wipes (to clean her), Lysol spray (to get rid of smell and sanitize surfaces) and Clorox cleaning wipes (to wipe down the toilet seat and sink) invaluable also.
It sounds like YOU need to clean her, remember, wipe front to back (or top to bottom) to avoid a bladder infection.
It is not uncommon for Alzheimer's patients to "get physical" with the back end.
You have to be the adult now and not "let" her continue with this unhygienic behavior.
Distraction often works well. While in the bathroom, "Auntie, we can have watch a favorite show (or some other enjoyable thing) when we're finished in here." She'll fight you but, as it goes on, she'll give in.
Good luck.