Bulimia nervosa is an eating disorder marked by uncontrollable binge-eating and subsequent purging by vomiting or using laxatives or diuretics. Other compensatory behaviors after binging include fasting and overexercising. People with bulimia tend to struggle with body dissatisfaction and low self-esteem . Anxiety , depression , and substance use can overlap with the disorder as well.
Why Does Bulimia Nervosa Develop?
Understanding what causes bulimia nervosa is essential for prevention and treatment. Research consistently shows that bulimia nervosa arises from a complex interplay of biological, psychological, and social factors — rarely from a single cause.
What Researchers Have Found
Research into bulimia nervosa has identified multiple contributing pathways. Studies using neuroimaging, genetics, and longitudinal data reveal that no single factor fully explains why bulimia nervosa develops.
Biological Factors
Biological contributors to bulimia nervosa include:
- Genetics: Family history increases risk; certain genes influence vulnerability
- Brain chemistry: Neurotransmitter imbalances (serotonin, dopamine, norepinephrine) play key roles
- Brain structure: Differences in the prefrontal cortex, amygdala, and hippocampus are documented
- Physical health: Chronic illness, hormonal changes, and sleep disruption can trigger or worsen bulimia nervosa
Psychological Factors
- Early experiences: Childhood adversity, attachment disruption, and trauma shape psychological vulnerability
- Cognitive patterns: Negative thinking styles, perfectionism, and rumination increase risk
- Coping skills: Limited emotional regulation skills make bulimia nervosa more likely under stress
- Personality: Certain traits (neuroticism, harm avoidance) are associated with higher risk
Social and Environmental Factors
Environmental factors — including chronic stress, relationship problems, financial difficulty, and major life events — can trigger bulimia nervosa in vulnerable individuals.
What Triggers an Episode?
Even in people with predisposing factors, bulimia nervosa often requires a triggering event:
- Major life transitions (job loss, relationship breakdown, bereavement)
- Prolonged stress without adequate recovery
- Substance use or withdrawal
- Physical illness or injury
- Social isolation or conflict
Protective Factors
Not everyone with risk factors develops bulimia nervosa. Protective factors include: strong social support, effective coping skills, physical health maintenance, access to care, and psychological resilience built through prior challenges.