1. Biological factors such as viruses and bacteria.
2. Food factors such as primary or secondary nutrients that cause or decrease the emergence of pathological differences.
3. Biochemical factors are changes in tissue composition or functions such as hormonal differences that automatically trigger the emergence of pathological differences.
4. Natural and mechanical factors, which are the change in natural factors such as heat, light, and natural disasters.
5 - Human factors are factors related to human life, such as psychological and social factors such as stress, anxiety and addiction.
6 - descriptive factors that are related to the person and different from the other mechanic by description such as age or height or weight or gender.
2. Food factors such as primary or secondary nutrients that cause or decrease the emergence of pathological differences.
3. Biochemical factors are changes in tissue composition or functions such as hormonal differences that automatically trigger the emergence of pathological differences.
4. Natural and mechanical factors, which are the change in natural factors such as heat, light, and natural disasters.
5 - Human factors are factors related to human life, such as psychological and social factors such as stress, anxiety and addiction.
6 - descriptive factors that are related to the person and different from the other mechanic by description such as age or height or weight or gender.