Men and women both face health problems. Barring certain subtle differences in endocrinology and reproductive physiology, the rest of the systems function nearly same in both, yet the incidence and presentation of certain diseases in women is different than men. This article discusses in detail this array of differences, ranging from difference in life expectancy in both, incidence of critical illness or cardiac arrest, to differences in incidence and outcome of various types of surgeries and medical illnesses with an aim to arrive at a possible scientific explanation as to why this difference exists.