Is there a correlation between mental illness and handwriting?

Byz, pull some links out of your hat.

I was just wondering, because I've been trying to journal everyday lately, and apparently I have like 10+ hand writing styles.

For example, yesterday started out as print, to cursive, to print, to all caps, to big block letters that I colored in, back to print, then doctor scribble at the end that I can't quite make out.