Thought I'd drop this in before the lock!
Despite the computer generated VO with its mispronunciations, it's quite interesting to read the comments of those in higher status, some of which has what's been posted:
Also noted is Pinkett-Smith's 'alopecia' issue. Sometimes this issue is caused by the mistreatment of your own head/ hair like having thin hair and dyeing it or whatever. Traditionally, alopecia is clumps of hair falling out producing bald spots, but this doesn't seem to be the case here.
In a small clip, you can clearly see her 'alopecia' is in a line across her head, which seems like a distressed pattern, not random spotting. This distressed balding can be when weaves or plaits are far too tight to the scalp and will loosen follicles over time if repeatedly actioned.
So, yeah, not always a 'medical condition' but can be self induced.