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.
Estrogen, a hormone produced by the ovaries, helps protect against bone loss. It is used as treatment for the prevention of osteoporosis. Replacing estrogen lost after menopause (when the ovaries stop most of their production of estrogen) slows bone loss and improves the body's absorption and retention of calcium.