This kind of sudden, heavy hair shedding usually points to telogen effluvium rather than a scalp problem. It's commonly triggered by low iron stores,
thyroid changes, or ongoing stress. Hair loss like this usually settles over a few months once the trigger is found and treated.
Next Steps
Ask for
ferritin,
thyroid and
vitamin D tests, since a normal haemoglobin alone doesn't rule out low iron stores.
Health Tips
See a dermatologist or gynaecologist in person if your periods are irregular too, since that points to a hormonal cause.