Researchers have found that stroke disproportionately affects women as compared to men due to factors such as fluctuations in naturally occurring hormone levels, early age of menarche and menopause. According to the researchers, stroke is a leading cause of disability that affects 55,000 more women than men each year. For the study, published in Stroke: Journal of the American Heart Association, researchers delved into the scientific literature to investigate evidence about risk factors that are unique to women.