As you may already know,
most often the cause of hair loss in cancer patients is
not the cancer itself, but the treatment. According to a
2015 study, approximately 65% of cancer patients
undergoing chemotherapy experience hair loss
during treatment. That's a large percentage of the
population that experiences the same serious side effect.
The specific mechanism of hair loss due to chemotherapy is actually a
type of hair loss called telogen effluvium.
Telogen effluvium is a hair loss condition in which one of the three
phases of your hair growth cycle is disrupted. The primary
phase of the hair growth cycle is called the anagen phase. This is where hair
grows, and 90 percent of your hair should be in this stage at
any given time. It then enters a resting phase called the
catagen phase before hibernating in the telogen phase.
Up to nine percent of your hair follicles might normally be in
this stage -- more is cause for concern. More, as you may have
guessed, is the definition of telogen effluvium: a
sudden change in the number of follicles that are actively
hibernating on your head. Visually, it looks like your
entire scalp is actually thinning, making your hair look thin.
Telogen effluvium is usually caused by a stressor, such
as surgery, major trauma, extreme stress, or chemotherapy.
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