1. Personality
1.1. Social skills
1.2. Worrying
1.3. Self-esteem
2. Environmental factors
2.1. Physical
2.1.1. Area of living
2.1.1.1. Urban
2.1.1.2. Rural
2.1.2. Access to sunlight
2.1.2.1. Vitamin D
2.1.2.2. Mediation of particular matter
2.1.3. Housing conditions
2.1.3.1. Crowding
2.1.3.2. Floor
2.1.3.3. Residential location
2.2. Social
2.2.1. Socioeconomical status
2.2.2. Education
2.2.3. Social support system
2.2.4. Working conditions
2.2.5. Big life events
2.2.6. Childhood trauma
3. Co-morbidities
3.1. Chronic diseases
4. Biological factors
4.1. Genetic predisposition
4.1.1. Stress regulating systems
4.1.1.1. HPA
4.1.1.2. ANS
4.2. Gender
4.2.1. Hormonal fluctuation in women
4.2.1.1. Menstrual cycle
4.2.1.2. Post-partum
4.2.1.3. Menopause
4.3. Age
4.3.1. Men
4.3.1.1. Before mid-puberty
4.3.2. Women
4.3.2.1. From 15 to 54 years
4.3.3. Early -life
4.3.4. Late life
5. Lifestyle
5.1. Nutrition
5.1.1. PUFAs
5.1.2. Zinc
5.1.3. Vitamine B12
5.1.4. Vitamine D
5.2. Physical activity
5.3. Smoking and drinking
5.4. Use of drugs
5.4.1. Cannabis
5.4.2. Hormonal contraception
5.4.3. Psychostimulant withdrawal
5.4.4. Corticosteroids