Hair loss in women is common and often has more than one contributing factor. Female pattern hair loss is genetic and usually shows as gradual thinning over the crown and a widening parting, while the frontal hairline is often preserved. Hormonal shifts around childbirth, stopping certain contraceptives, or menopause can trigger noticeable shedding.
Telogen effluvium is a temporary heavy shedding that follows a stressor such as illness, surgery, crash dieting or emotional stress, typically a couple of months earlier. Medical causes like thyroid disorders, iron deficiency and polycystic ovary syndrome can also contribute, as can some medications and very tight hairstyles (traction alopecia).
Because the causes overlap, a doctor's assessment with relevant blood tests is the best way to find the reason and what, if anything, will help. Seek review sooner for patchy loss, scalp symptoms, or signs of a hormonal condition such as irregular periods or excess facial hair. This is general information only.