It's typical from what I understand. An I think they say its from lack of Proteins. Idk if that's true or not but after surgery I purchased ISOMIL((i think thats the name, its a high Protein clear liquid) from a health food store and I drank one bottle through out my day after surgery for about a month. And now that I eat solid foods, I eat about a steak a week, but lots of Beans, spinach, etc.., any high protein foods, and I haven't lost any hair at all.