This book was designed to serve as a guide to early recognition, diagnosis, and treatment of occupational diseases, and for health professionals responsible for planning occupational health services at the workplace. The book was also intended to create awareness among makers of policy, employers, and employees of factors which are important in preventing occupational diseases. Means of carrying out effective monitoring of adverse health conditions were also presented. The book specifically discussed the principles of early detection of occupational diseases, described specific occupational diseases and approaches for their early detection and control, and offered an explanation of the physiology of the body systems affected by occupational diseases. Biological and environmental methods for the assessment of exposure to occupational hazards were also described. Specific diseases discussed included: pneumoconioses caused by sclerogenous mineral dusts, bronchopulmonary diseases caused by hard metal dusts; bronchopulmonary diseases caused by cotton dust, flax, hemp, or sisal dust; occupational asthma; extrinsic allergic pneumonitis; diseases caused by beryllium (7440417), cadmium (7440439), phosphorus (7723140), chromium (7440473), manganese (7439965), arsenic (7440382), mercury (7439976), lead (7439921), fluorine (7782414), carbon-disulfide (75150), carbon-tetrachloride (56235), trichloroethylene (79016), hexachloronaphthalene (1335871), polychlorinated-biphenyls (1336363), vinyl-chloride (75014), benzene (71432), toluene (108883), xylene (1330207), aniline (62533), nitrobenzene (98953), nitric-acid esters, alcohols, glycols, ketones, asphyxiants; and diseases caused by noise, vibration, compressed air, ionizing radiation, and parasites.