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What are the warning signs of tardive dyskinesia?
Jerky movements
lip smacking.
moving your mouth, jaw or tongue.
tapping or moving your hands or feet.
movement in your hips.
movement in your upper body.
blinking your eyes a lot.
puffing out your cheeks.
making noises or facial expressions you cannot control.
Alva Deer mentioned it.
Caused by a medication, it has other symptoms such as lip smacking, tongue movements, and tic-like movements in other body parts.
Do look that up online. It can be improved by discontinuing the medication causing it.
Also look up tics.
Look up stimming.
There also can be mouth movements due to ill fitting dentures. These things become habitual. I would discuss with her MD.
As others have pointed out, it this behavior could be caused by a lot of things, so starting with a medical exam as a baseline would be the logical place to start.
Did she used to smoke?
Is this making a sound that she likes?
Is she doing this at a particular time of day?
Is she occupied when she is doing it? Might be a way for her to concentrate.
If she is not occupied it might be a way for her to "do something"...kinda like twiddling your thumbs.
As you can see there are hundreds of reasons someone might do something.
If she does not seem to be in pain.
If this does not distress her.
I would not worry about it.
If it bothers you that is a different matter...get used to it.
You do not mention dementia in your profile but you do mention stroke there may be some Vascular Dementia at play here....my Husband "hummed" or I should say he made noises. That was his way of coping sort of like they way a child with Autism may rock or make noises. I learned to shut it out as best as I could. And I knew when he was gone I would miss the noise...and I did and sometimes still do. Whenever I was on the phone his noises would get louder almost like he wanted to participate in the conversation.