Forehead Balding ? Maybe Check Your Hormones
Usually this type of hair loss is the so called nonscarring type, meaning that there is hope for the recovery of this hair lost once the problem is treated. Medically this is alopecia refers to hair loss without permanent destruction of the hair follicle, although we can’t be sure hair follicles are not being destroyed. Hormonal hair loss should really be accompanied by other symptoms of hormone imbalance. How is the rest of your skin? Dry, flaky, itchy, or pimply? Symptoms of the male hormone excess can be chin or upper lip hair, deepening voice, bigger Adam's apple and acne, but blood testing is the way to sort out the real cause.
The hair grows from follicles in healthy scalp and it cycles though growth of the hair from a follicle, then a period when the follicle withers or involutes and when that happens to that follicle with shedding of hair, and finally a rest period or the follicles hibernate. This is a very slow, three step process of anagen, catagen, and telogen. An imbalance of what hair follicles are resting and what follicles are growing will produce what you see as sudden shedding. If this imbalance goes on for years, you'll have very scant hair.
Voluminizing shampoos and wearing hair curly can help the fuller look, but getting to the bottom of this is important. First just be nice to your hair, then get in there and see if the scalp is healthy, finally, get some quick nutritional and hormone checks like a basic thyroid and menopause check. Both zinc and biotin will help your hair grow. If none of those are yielding any answers it's time to go in for the full differential diagnosis. In the differential diagnoses are some fairly intimidating conditions: anagen effluvium, androgenetic alopecia, chemical alopecia, folliculitis (mild), inherited disorders of the hair shaft, telogen effluvium, alopecia areata, and traumatic alopecia. Some might just be aging and an actual decrease in each hair's thickness can be seen. Hairs go from nice round, all alike strands, to irregular and inconsistent shapes and contours. Some follicles just quit producing hair, like your eye lash hairs (yeah Latissecan wake that up)
! The hormonal work up will be important: what are your levels and do they need to be back in balance. Some women will gain hair from suppression of their male hormones, and some will gain from treatment with male hormones. Some times experimentation is necessary, but it's a frustratingly slow process.
Your gyno might be able to help, or your dermatologist. Don't just "brush" it off to no big deal, hair loss can actually be a symptom of other underlying issues and if it goes on long enough, everyone deserves at least a brief check up.