Paleopathology (palaeopathology, traditional British spelling) is the study of ancient health and disease. The field is interdisciplinary, stretching from art history to paleontology and from parasitology to genomics.
Less common symptoms of low estrogen levels include: 1  Thinning hair. 2  Weight gain. 3  Arthritis. 4  Difficulty concentrating.
Symptoms of low estrogen typically occur in women approaching and experiencing menopause. However, younger women can also experience low estrogen, but their symptoms (and causes) differ from menopausal women. There are three types of estrogen: estriol, estradiol and estrone.