Sorry, I know hair loss and thinning hair is very troubling. Most likely the hair loss is a delayed reaction (about
2-3 months) from the worst of our flare and hair regrowth is a delayed reaction from recovery from our flare (again delayed by about
2-3 months).
Hair loss or thinning hair happens to those who are not on any medications for their UC. Hair loss happens to those that are on the anti-inflammatory mesalamines, the thiopurines (like 6mp/imuran), to those on biologics (like humira or enyvio) despite those medications having very different active and inactive ingredients, and despite them all having very different mechanisms of action.
Here's a good watch for you explaining it more, IBD School, Video 205 – Telogen effluvium (hair loss in IBD):
http://www.med.umich.edu/ibd/school/video205.htmlHeard some say that biotin-based shampoos help with hair regrowth and thicken hair.