Hazard and possibility interact together to create risk.
Physical hazards are conditions or situations that can cause the body physical harm or intense stress. Physical hazards can be both natural and human made elements.
Chemical hazards are substances that can cause harm or damage to the body, property or the environment. Chemical hazards can be both natural or human made origin.
Biological hazards are biological agents that can cause harm to the human body. These some biological agents can be viruses, parasite, bacteria, food, fungi, and foreign toxin.
Psychological hazards are created during work related stress or a stressful environment.
Radiation hazards are those which cause harm or damage to the human body by affecting the cell directly.