Upright regrowing Hairs in Telogen Effluvium

URH Start Thinner and Thicken Up over Time

A true upright regrowing hair (URH) in the setting of a hair shedding disorder (telogen effluvium) starts out thinner than the original thickness it once. As it continues to sprout up and up and up it thickens up. As an analogy, I often explain that new trees are never massive diameter little trees. That would be strange. A new tree is quite thin and then thickens up over time. A 500 800 year old tree may reach several meters in diameter. Nobody has ever seen a fledgling tree that is several meters in diameter as it first emerges from the ground.