The determinants of health include: the social and economic environment, the physical environment, and. the person's individual characteristics and behaviours.Addressing social determinants of health is important for improving health and reducing longstanding disparities in health and health care. There are a growing number of initiatives to address social determinants of health within and outside of the health care system. Many of the key drivers of health reside in our everyday living and working conditions—the circumstances in which we grow, live, work and age. These social determinants include factors such as income, education, employment and social support. Perhaps the most powerful social determinant of health is income. All of us have seen too many patients who could not afford their medications, a healthy diet, or a proper place to live—and how this affected their health status. Sex can be a factor that influences health, for example, men and women may show different symptomology for diseases and conditions and may respond differently to drugs and therapeutics due to physiological and hormonal differences as well as differences in body composition. In the definition of epidemiology, “determinants” generally includes the causes (including agents), risk factors (including exposure to sources), and modes of transmission, but does not include the resulting public health action.Doctors can use evidence and influence to have a positive impact on health inequalities. Doctors can use their position and their expertise to advocate for change to areas outside traditional medical areas, and to promote the generation of research, especially on the efficacy of prevention measures. The physical environment is an important determinant of health. At certain levels of exposure, contaminants in our air, water, food and soil can cause a variety of adverse health effects, including cancer, birth defects, respiratory illness and gastrointestinal ailments.