Problem drinking has multiple causes, with genetic, physiological, psychological and social factors all playing a role. Not every individual is equally affected by each cause. For some alcohol abusers, psychological traits such as impulsiveness, low self-esteem, and a need for approval prompt inappropriate drinking. Some individuals drink to cope with or "medicate" emotional problems. Social and environmental factors such as peer pressure and the easy availability of alcohol can play key roles. Poverty and physical or sexual abuse increase the odds of developing alcohol dependence.