In both women and men, the most likely cause of hair loss is Androgenetic Alopecia.

Some others may be:

  • Diseases, such as ChronicTelogenEffluvium (gradual hair loss)
  • Postmenopause(in women over 40)
  • Pregnancy: the massive production of the hormone estrogen causes the follicles to enter their “growth phase”. After giving birth, the hormonal balance is restored and the follicles move to the “loss phase”, causing a large amount of hair to fall all at once.