-Biological: Bacteria, insects, viruses, plants, animals, birds, humans, etc.

-Chemical: The toxic, chemical and physical properties of the material.

-Ergonomic: Posture, workflow, workstation design, poor equipment design, improper workstation setup, heavy or awkward lifting, repetitive movements, etc.

-Physical: Loud noises, extreme pressures, magnetic fields, radiation, fire, poor lighting, unsafe machinery, misused machinery, obstructions in walkways, slippery floors, etc.

-Psychological: Violence, stress, constant low-level noise, threats of danger, discrimination, harassment, public relations, intense workloads, shift work, etc.

-Safety: Equipment malfunctions, equipment breakdowns, inappropriate machine guarding, tripping and slipping hazards, etc.