Anorexia Nervosa
Severe restriction of food intake driven by an intense fear of weight gain and a distorted body image.
What it is
Anorexia Nervosa involves severely limiting food intake, often to the point of significant weight loss, driven by an intense fear of gaining weight and a distorted perception of one’s own body. It’s one of the most medically serious eating disorders, because prolonged restriction directly affects how the body’s core systems function.Signs & symptoms
Behavioral
- Skipping meals or eating very small portions
- Elaborate rules or rituals around food
- Intense focus on calories, weighing, or measuring food
- Denial that low weight is a problem
Physical
- Significant, visible weight loss
- Thinning hair, dry skin, feeling cold often
- Dizziness or fainting
- Irregular or absent menstrual periods
Emotional
- Intense fear of weight gain
- Distorted body image
- Anxiety specifically around eating or meals
- Perfectionism, need for control
Causes & risk factors
There’s no single cause. Genetic predisposition, certain personality traits (perfectionism, anxiety-proneness), and sociocultural pressure around thinness all play a role, and it most often first appears during adolescence — though it can develop at any age.Related conditions
Anorexia is closely related to, and sometimes confused with, a few other patterns covered in our Compare section.Treatment
Treatment typically starts with medical stabilization, since prolonged restriction affects the heart, bones, and hormonal system, followed by nutritional rehabilitation and therapy (commonly CBT or family-based treatment for adolescents). The right level of care depends on medical severity — see our full guide to levels of care for how that’s determined.If you notice medical warning signs
Fainting, chest pain, a very slow or irregular heartbeat, inability to keep food or water down, or thoughts of self-harm are medical emergencies — not something to wait out. See our Safety Red Flags guide, and call or text 988, or call 911 for emergencies.Myths vs. facts
Myth: Anorexia only affects teenage girls. Anorexia can develop at any age and in any gender. Rates of diagnosis in midlife adults and in boys and men are increasingly recognized — they were likely always present, just historically under-diagnosed because the stereotype shaped who got screened.
Myth: You can tell by looking at someone whether they have anorexia. Significant weight loss is one marker, but restriction and the fear/body-image distortion driving it can be present well before weight loss becomes visible, and some people maintain a body weight that doesn’t immediately signal a problem to others.
Myth: Anorexia is a choice or about vanity. The restriction is driven by an intense, often involuntary fear response and a genuinely distorted self-perception — not a lifestyle preference. Comparing it to a diet choice tends to make it harder for someone to ask for help.
What treatment actually looks like
Treatment is sequenced around medical stability first, because prolonged restriction affects the heart, bone density, and hormonal system in ways that can be dangerous to reverse too quickly. A typical path looks like: a medical evaluation to check vitals and labs, nutritional rehabilitation paced by a dietitian (weight restoration is deliberately gradual — too fast carries its own medical risk, known as refeeding syndrome), and therapy running alongside it. For adolescents, family-based treatment (sometimes called the Maudsley approach) is one of the most studied approaches and involves parents taking an active role in meals during the early phase. For adults, CBT-based approaches are more common. None of this happens on a fixed timeline — how long each phase takes depends on medical severity and how the person responds.
When to seek help
Anorexia carries real, sometimes acute medical risk from starvation, so don’t wait for it to get worse before reaching out.Frequently asked questions
Is anorexia the most dangerous eating disorder?
It carries some of the most direct medical risk of any eating disorder because prolonged restriction affects the heart, bones, and hormones directly, but every eating disorder can become medically serious, including ones without dramatic weight loss (see our OSFED and bulimia pages). Severity isn’t something to rank casually — it’s something a clinician evaluates directly.
Can someone have anorexia without being visibly underweight?
Yes — this is formally recognized as atypical anorexia, where the psychological and behavioral pattern is present at a body weight that isn’t clinically “underweight.” See our OSFED page for more on how that’s diagnosed.