Into which hazard groups are accidents commonly categorized?

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Hazards are typically grouped by the type of threat they pose to people and equipment. The standard four groups cover most workplace risks: chemical hazards involve exposure to hazardous substances; physical hazards include heat, cold, noise, vibration, and radiation; biological hazards involve living organisms or their byproducts; ergonomic hazards arise from the way work is designed—repetitive tasks, awkward postures, and heavy lifting—that can lead to musculoskeletal injuries. This framework is widely used because it maps to the main ways people get hurt and helps focus mitigation efforts. Other listed groupings mix domains that aren’t the conventional accident hazard categories: mechanical, electrical, thermal & radiative are specific hazard types but don’t form a common four-group classification; cognitive, social, emotional, financial describe psychosocial factors rather than the primary hazard types that cause accidents; nutritional, environmental, occupational, recreational are broad domains and not a cohesive hazard-group scheme used for accident categorization.