Easy question, complicated answer.
Common pattern hair loss is known to be triggered by three factors:
1) Genetics
2) Age
3) Circulating hormones
A number of investigators, including those in our lab and elsewhere, believe that stress constitutes a fourth less well-appreciated factor. Here, aside from the well-described androgen hormone 5 alpha-dihydrotestosterone (DHT) other biochemical triggers may negatively influence the health, vitality and growth rate of susceptible scalp hair.
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