There are six main categories of hazards in the workplace:
Biological including viruses, bacteria, insects etc.
Chemical hazards that can cause blindness, respiratory problems, skin irritation.
Physical hazards such as noise, radiation, height, pressure.
Safety hazards such as exposed wires, tripping hazard.
Ergonomic hazards that can cause musculoskeletal injuries.
Psychosocial hazards such as sexual harassment, stress and workplace violence.