Objective: The goal of this overview is to examine male/female differe
nces in psychopathology in light of the known effects of gonadal stero
ids, especially estradiol, on neural function. Method: The epidemiolog
y of specific psychopathological syndromes is highlighted with respect
to male/female differences and discussed against the backdrop of rece
nt neuroendocrine findings. Results: A number of differences between t
he sexes in rates of illness and course of illness are documented, wit
h Alzheimer's disease, schizophrenia, alcoholism, and mood and anxiety
disorders each illustrating slightly different hormone-mediated risks
and buffers. Conclusions: Estrogens are neuroprotective with respect
to neuronal degeneration, growth, and susceptibility to toxins. The cy
clic fluctuations of estrogens and progesterone enhance the response t
o stress, which confers susceptibility to depression and anxiety.