09/06/2026
Hair grows in three phases, and the rhythm between them is what changes through perimenopause.
Anagen is the active growth phase, where 85 to 90 percent of your hair lives, for two to six years at a time.
Catagen is the short transition phase, around two to three weeks, where growth slows and the follicle prepares to rest.
Telogen is the resting and shedding phase. It's normally a small fraction of your hair, but it increases through perimenopause, which is why the shedding can feel sudden even though the shift has been gradual.
One small thing that supports the body through this shift: ask your GP to check your ferritin at your next blood test. Above 70 is what hair tends to need to stay in its growing phase. Most people don't think to ask, and most labs flag "normal" at a much lower number.
The follicles haven't given up. The conditions around them have changed🖤