A ready reference for Primary Care Providers as part of Basic Occupational Health Services (BOHS). Illnesses affecting people in informal occupations need to be understood within the context of the nature of their work. This has a significant influence on etioloy, mode of transmission or progress of the illness, diagnostic investigations required and its eventual outcome. The ready reference will go a long way in diagnosing occupational nature of many illnesses and their peculiar affections specific to the practices and activities in informal occupations