While stress/thyroid/vitamin deficiency can cause hair loss, is hair loss around the crown of the head normal?

Male pattern loss. Hair loss around the crown of the head in men, is usually part of male pattern hair loss -- and while upsetting to many men, is "normal." http://www.Webmd.Com/skin-problems-and-treatments/hair-loss/hair-loss-introduction-mens some research is now developing about vitamin d in this situation -- it's not ready for clinical application yet, as it's only gone as far as animal research.