… hair loss is rarely the only sign of a thyroid problem. Other symptoms include weight gain or loss, sensitivity to cold or heat, and changes in heart rate.
and
2.Polycystic Ovary Syndrome (PCOS)
Women with polycystic ovary syndrome (PCOS) have a chronic hormonal imbalance. The body makes higher levels of androgens than expected. This often causes extra hair to sprout on the face and body, while hair on the scalp grows thinner. PCOS can also lead to ovulation problems, acne, and weight gain. But sometimes thinning hair is the only obvious sign.
These days, Pinkett Smith said she enjoys using turbans, as they help conceal her condition and are an empowering fashion choice.
“When my hair is wrapped, I feel like a queen,” she said.