Typically one scientist may be involved in several different fields.
Toxicologists study the way in which hazards harm the body.
Pharmacologists study the beneficial effects of chemicals. Industrial hygienists study how to stop or prevent exposure to hazards. Epidemiologists study what health problems occur in groups of people and investigate the causes. Occupational and Environmental Medicine physicians diagnose and treat patients exposed to health hazards and in their work or other environments. All rights reserved.