Lack of proper oxygenation
Eustress
Venous insufficiency
Immunocompromised condition
Estrogen
Older age
Favorable hereditary factors
Poor sleep or prolonged immobilization
Detrimental hereditary factors
Younger age
Proper rest or proper immobilization
Venous sufficiency
Drugs when properly used and dosed
Infections
Poor health and nutrition
Good health and nutrition
Dystress
Androgen
ETOH and smoking
Proper oxygenation
