We'll give you the symptoms, and you tell us what the problem is — remember, your co-worker could be suffering something physical or mental.
Iron deficiency anemia
Borderline personality disorder
A migraine prodome
A light snack
Social anxiety disorder (SAD)
Conjunctivitis (pink eye)
Narcissistic personality disorder
Smart or stupid, intelligence isn't criteria for being a sociopath.
All of these are tics.
Obsessive-compulsive disorder (OCD)
Probably not; angular cheilitis is not contagious.
He's a slacker.
Middle East respiratory syndrome (MERS)
Type 2 diabetes.
All of these