Certainly autoimmune diseases are a factor in hair loss, certainly the meds are, at least for me, but my hair brush was too. At the advice of my beautician, I changed brushes to 'the wet brush', that I purchased there in the shop.
I've used this for one week and have less hair in the brush after a week than I did when using the old one once. It can be used on wet or dry hair.
Just click the link above, it shows a picture of the brush, and if you read the product details, it explains that it is a detangler that helps prevent hair breakage and loss.
I have also had the most beautiful thick long wavy hair, but due to SS and menopause it is starting to fall out a lot more so I take a vitamins called( hair skin and nails) and it works a treat,,, I also only use a product called ( Oil of Morocco) shampoo and conditioner ,, and leave in conditioner it is expensive but lasts months and months, and does not strip hair of the natural oils in the scalp sometimes you have to increase your iron in take as well ,,