My son grunts I try to mimic it to show behavioral specialists she was familiar with the sound. Son is 2.5 and autism it's a lil worse in stores along with the sucking thru teeth sound. Still learning on his quirks.
But on another person my Mom does the clear throat/grunt thing. I don't say anything don't want to embarrass her and I wonder if she even knows she is. She does have anxiety take some meds but I found she does it worse when taking Valium I hate when she takes those pills.
Agree to much Internet, over research can be harmful. There comes a time when you do have to just observe and accept what's going on.