I m female, 55 years of age, 110 lbs., workout 4 to 6 times a week, eat pretty healthy, but have my moments. I also, drink 8 glasses of water a day. I m losing my hair on my head and pelvic area, but not any where else. I m losing my hair from the root, it is not breaking off. The doctor has ruled out any thyroid issue. What could this be?