FPHB is primarily caused by a combination of genetic and hormonal factors: 

• Genetics:

  Women who have a family history of hair loss are more likely to develop FPHB. 

• Hormones:

  Androgens, such as testosterone, play a role in hair loss. In women with FPHB, the hair follicles become more sensitive to androgens, leading to hair thinning. 

Symptoms: 

FPHB typically presents as:

• Gradual thinning of hair, particularly on the top and crown of the head

• A widening of the part

• Hair follicles becoming smaller and producing thinner, shorter hairs

• May not affect the hairline at first