The list of occupational disease is a collection of diseases caused by exposure to hazardous risks during occupational activities. It reflects the increasing knowledge and cognition for changes in the types of work and rapid advancements of medical sciences and diagnostic technology of diseases. It plays a critical role in both of prevention and compensation of occupational diseases.
Following the “Regulation on Scope of Occupational Diseases and Treatment Occupational Disease Patients” first released in 1957 (4), the list of occupational diseases was first published with 14 occupational diseases (Table 1). Over the past 30 years, there have been remarkable changes in the types of work and the demographics of the workforce in China. The list of occupational diseases was revised in 1987 by adding occupational diseases from 14 to 99 in 9 classifications (5). A significant change was the increase in the number of diseases and the classification of diseases.
No. Name of Occupational Diseases 1 Occupational poisoning 2 Occupational pneumoconiosis 3 Occupational heat stroke and heat cramp 4 Occupational sunstroke 5 Occupational dermatoses 6 Electric ophthalmia 7 Occupational deafness 8 Occupational cataract 9 Decompression sickness 10 Mountain sickness and Aerial sickness 11 Vibration disease 12 Occupational radiation-induced diseases 13 Occupational anthrax 14 Occupational forest encephalitis
Table 1. The list of occupational diseases published in 1957.
On May 1, 2002, the “Law on Prevention and Control of Occupational Disease” was approved by the National People’s Congress Standing Committee, and the “Regulation on the Scope of Occupational Diseases and Treatment of Occupational Disease Patient” was jointly revised by the Ministry of Health and the Ministry of Labour. Meanwhile, the “Occupational Disease Classification and Catalogue” was revised again, and the list of occupational diseases was also revised again by increasing occupational diseases from 99 in 9 classifications to 115 in 10 classifications including the separation of the classification of radioactive diseases.
With rapid socioeconomic development and extensive applications of new technology and new materials in industry, some new and unidentified hazardous risks could incur new occupational diseases, so the “Occupational Diseases Classification and Catalogue” has been revised again in 2013 to meet the changing needs of prevention and control of occupational disease (3). In this new revision, the changes added 18 occupational diseases and expanded the scope of occupational diseases. The number of occupational diseases was increased from 115 to 132 including 4 open items (Table 2). In the new revision’s structure, these 132 diseases were divided into 10 classifications with classifications 1 through 4 being occupational diseases in target organs; 5 to 8 being occupational disease caused by exposed to hazards including chemical, physical, radioactive, and biological hazardous risks; 9 being occupational cancer; and 10 being other occupational diseases.
Classification Number of occupational diseases Number of open items Total 1 Occupational pneumoconiosis and other occupational respiratory diseases 18 1 19 1.1 Occupational pneumoconiosis 12 1 13 1.2 Other occupational respiratory diseases 6 6 2 Occupational dermatoses 8 1 9 3 Occupational eye diseases 3 3 4 Occupational otolaryngologic and oral diseases 4 4 5 Occupational chemical poisonings 59 1 60 6 Occupational diseases caused by physical factors 7 7 7 Occupational radiation-induced diseases 10 1 11 8 Occupational infectious diseases 5 5 9 Occupational tumors 11 11 10 Others* 3 3 Total 128 4 132 * “others” as used in the “Occupational Disease Classification and Catalogue” is a category that includes only specified diseases, such as metal fume fever and underground workers’ bursitis.
Table 2. Occupational disease classification and catalogue as revised in 2013.
The increasing number of potential hazards have contributed to the increase of occupational diseases. It is estimated that occupational exposure may contribute to approximately 15% of chronic obstructive pulmonary disease (COPD) (6). In the new revision, COPD caused by irritant chemicals, pneumoconiosis caused by exposed to metal dusts (tin, iron, antimony, and barium), and hard metal lung disease were recognized and added to the list. Cancer is also becoming a family of common chronic and non-communicable diseases in the world as 3.8 million of new cases of malignant tumors were reported in 2014 in China (7).
Occupational cancers can arise because of extensive and continuous exposure to well-known and suspected occupational carcinogens. Lung cancer and malignant mesothelioma are likely caused by occupational exposure to asbestos, an estimated 9% of lung cancer and 2% of leukemia were related to exposure to occupational carcinogens in 2000 (8). In the new revision, additions to the list included lung tumor and mesothelioma caused by exposed to erionite; skin cancer caused by exposed to coal tar, coal tar bitumen and petroleum bitumen; and bladder tumor caused by exposed to β-naphthylamine.
With widespread occupational and non-occupational exposure to chemicals, it is critically important to identify exposure to unknown or unidentified chemicals and to register and report potential chemical poisonings. In new revision, 5 diseases were added to the list including poisoning caused by exposed to indium and related compounds; poisoning caused by exposed to bromopropane; poisoning caused by exposed to iodine methane; and poisoning caused by exposed to chloroacetic acid and ethylene oxide.
The reporting system of occupational diseases plays an important role on the collection effective data of occupational disease diagnosis and medical examination of workers exposed to hazards in the workplace. The current reporting system is not a full-process reporting system as it lacks information on medical examinations of workers on pre-employment and post-employment and information on the follow-up of suspected patients and patients. At the request of the Information System for Prevention and Control of Disease, a full-process reporting system including hazard measurement in the workplace, medical examinations of workers exposed to hazards on pre-employment, during employment, and post-employment, diagnosis of occupational diseases, and follow-up of suspected patients and current patients will be developed for the needs of occupational disease reporting in the future.
The list of occupational diseases includes a wide range of occupational diseases officially recognized and represents knowledge on the prevention and treatment of diseases caused by exposure to hazards during occupational activities. It plays a critical role in both the prevention and compensation of occupational diseases. The International Labour Organization (ILO) published the first international list of occupational diseases in 1925 beginning with 3 diseases (9), and this list was revised in the 1960s, 1980s, and 2002 to reflect scientific advancements in diagnostic techniques and medical sciences (10-13). The latest version of ILO list of occupational diseases was published in 2010 (14) and includes a range of occupational diseases recognized internationally from illnesses caused by chemical, physical, and biological agents to respiratory and skin diseases, musculoskeletal disorders, and occupational cancer. Mental and behavioral disorders have been included for the first time in the ILO list (Table 3). Globally, 30 countries were found to have an occupational disease list with a similar structure to the ILO list (13). Although the number of traditional occupational diseases is still increasing because of widespread traditional hazards such as dust, noise, and chemicals in workplaces, work-related diseases, such as work-related musculoskeletal diseases (e.g. lower-back pain), and work-related stress are significant contributors to the global burden of occupational diseases, and work-related disease and death have been recognized as a major international challenge relevant to global occupational health according to estimates of GBD 2017 (15). With the rapid development of medical science, increasing awareness on protection of worker’s health, and improving ability to compensate patients with occupational diseases, it is necessary to continue to identify diseases through occupational health and medical practice to meet the needs of occupational disease prevention and to protect current and future workers’ health.
Classification Number of occupational diseases Number of open items Total 1 Occupational diseases caused by exposure to agents arising from work activities 1.1 Diseases caused by chemical agents 40 1 41 1.2 Diseases caused by physical agents 6 1 7 1.3 Biological agents and infectious or parasitic diseases 8 1 9 2 Occupational diseases by target organ systems 2.1 Respiratory diseases 11 1 12 2.2 Skin diseases 0 4 4 2.3 Musculoskeletal disorders 7 1 8 2.4 Mental and behavioral disorders 1 1 2 3 Occupational cancer 20 1 21 4 Other diseases 1 1 2 Total 94 12 106
Table 3. International Labour Organization (ILO) international list of occupational diseases as revised in 2010.