Stress can definitely cause hair-pulling, as can allergies. Some cats deal with changes in their environments or routines easily and calmly, while others become so stressed that they make themselves ill. My boy, Phantom, had a bout of stress-related interstitial cystitis a couple of years ago. Over the last year or two, his stress response has shifted to hair-pulling. Now I think the hair-pulling has just become habit to him.
Laurie
Laurie