The best way to think of the way hair grows is to picture a garden. How well it grows is completely a result of what is happening “underground.”
“Like a garden, a normal hair cycle should lead to a product, which is the hair,” says Wendy Roberts, MD, a dermatologist in Rancho Mirage, CA. “Growth cycles are important because when they go awry, that is one of the reasons we have hair loss.”
And things that interfere with the cycle — like medication, illness, infections, or chemicals — have the potential to stop hair from being formed properly.