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.
A drop in estrogen levels may occur: 1  After menopause. 2  During the years leading up to menopause (perimenopause) 3  After surgical removal of both ovaries (surgical menopause)  After pelvic radiation therapy for 1  cancer. After chemotherapy for cancer.  As a side effect of breast cancer hormonal treatment.