Bulimia nervosa: symptoms, causes and treatment

Key points

• Bulimia nervosa is an eating disorder in which binge eating is followed by behaviour meant to compensate for it [1][2].
• Most people with bulimia nervosa are not underweight. This is the main reason it goes unrecognised [6][8].
• Restriction drives bingeing, bingeing drives shame and compensation, compensation drives more restriction. Treatment targets that cycle [1].
• NICE recommends guided self-help first for adults, eating-disorder-focused CBT if that fails, and family therapy for young people [1].
• Physical effects can be serious, and dental erosion is one of the signs NICE tells professionals to look for [1][6].
• It is treatable, full recovery is possible, and outcomes are better than for anorexia nervosa [1][6].

What bulimia nervosa is

Bulimia nervosa is an eating disorder in which a person repeatedly eats a large amount of food in a short time, feels out of control while doing so, then acts to compensate for it. It is a serious mental illness and can affect anyone of any age, gender or background [2][6].

If you need help now. Samaritans: call 116 123, free, 24/7. Shout: text SHOUT to 85258. NHS 111, then choose the mental health option. Call 999 if anyone is in immediate danger. For eating disorder support, Beat’s helplines are open 3pm to 8pm, Monday to Friday: England 0808 801 0677, Scotland 0808 801 0432, Wales 0808 801 0433, Northern Ireland 0808 801 0434. Beat also runs one-to-one webchat and email support [5].

Most people with bulimia nervosa are not underweight. Weight tends to stay roughly the same, or move up and down [6][8]. It is therefore hard to spot from outside, and people who have it often decide they are not unwell enough to ask for help [6]. NICE tells services not to use single measures such as body mass index, or duration of illness, to decide whether to offer treatment [1].

NG69 quotes a Beat estimate, based on 2012 to 2013 hospital admissions, of over 725,000 people in the UK with an eating disorder, as many as a quarter of them male [1]. Beat’s more recent estimate is at least 1.25 million. Beat estimates around 1% of females and 0.33% of males aged 11 to 34 have bulimia nervosa [7].

Symptoms

Nobody has all of these, and having some does not confirm a diagnosis.

Eating and behaviour: - Eating much more than usual in a short time, with a sense of being unable to stop [2]. - Behaviours afterwards intended to undo the eating [6]. - Restricting food between episodes, and avoiding eating with others [1][6].

Thoughts and feelings: - Strong concern about shape and weight, and fear of gaining it [1][2]. - Shame or harsh self-criticism after eating, low mood, anxiety or irritability [1][2].

Physical: - Tiredness, a sore throat, changes to periods, and damage to tooth enamel where purging is repeated [1][2][3].

It is commonly confused with binge eating disorder, where bingeing happens without regular compensation, and with anorexia nervosa, where restriction dominates and low weight is present [8].

Types

Bulimia nervosa is one diagnosis rather than a set of subtypes, but presentations differ.

• Purging presentations, where the compensatory behaviour is purging [6].
• Presentations where the compensatory behaviour does not involve purging [6].
• Presentations that do not meet the full criteria, which Mind calls other specified feeding or eating disorder, or OSFED, and says are not less serious [8].

Severity is judged by frequency and distress, not by weight [1].

Causes and risk factors

There is no single cause. It develops from a combination of factors, and for most people no one factor can be singled out [1][6].

Factors the evidence supports: - Extreme dietary restraint, which NICE names as something treatment must address [1]. - Strong concerns about body shape and weight [1]. - Difficulty managing distress, which NICE describes as bingeing in response to difficult feelings [1]. - Other mental health conditions, particularly low mood and anxiety [2].

The evidence does not support the popular explanations: that it is vanity or attention-seeking, that it affects only young women, or that someone must be underweight for it to count [1][6].

The cycle explains why treatment is built the way it is. Restriction, whether skipping meals, delaying eating or cutting out foods, leaves the body under-fed and makes loss of control more likely. A binge follows. The binge brings shame and fear of weight gain, which drives compensation. Compensation brings brief relief and a resolve to restrict harder, setting up the next binge. Willpower alone rarely breaks it, which is why NICE has CBT-ED start with regular eating, before dietary restraint, shape and weight concerns, and bingeing in response to distress [1].

How it is diagnosed

In the UK, bulimia nervosa is diagnosed by a doctor or mental health professional, usually after a GP referral to a community eating disorder service [1][2].

• The GP asks about eating, shape and weight concerns and mood, and may run physical checks [2].
• NICE tells professionals to refer immediately to a community-based, age-appropriate eating disorder service when one is suspected [1].
• Screening questionnaires such as SCOFF may be used, but NICE says they must not be the sole basis for deciding whether someone has an eating disorder, nor may single measures such as body mass index or duration of illness decide whether treatment is offered [1].
• Waiting times vary by area. NHS England runs an access and waiting time standard for children and young people [9]. No reliable national figure exists for adults.

A diagnosis is a route into a treatment pathway. It does not mean the condition is permanent, and nobody must reach a particular physical state to qualify [1].

Treatment

NICE sets out an order of preference, and psychological treatment comes first [1].

For adults: - NICE says to consider bulimia-nervosa-focused guided self-help first: cognitive behavioural self-help materials, plus brief supportive sessions with a trained practitioner [1]. - If that is unacceptable, unsuitable or has not worked after four weeks, NICE says to consider individual eating-disorder-focused CBT, or CBT-ED, typically up to 20 sessions over 20 weeks [1].

For children and young people, NICE says to offer bulimia-nervosa-focused family therapy, or FT-BN, typically 18 to 20 sessions over six months, with parents and the young person working together [1].

Medication and other support: - NICE says not to offer medication as the sole treatment [1]. The NHS notes antidepressants are sometimes prescribed for related conditions [4]. Nobody should start or stop a medicine without speaking to their prescriber. - A dietitian may be involved alongside therapy [4]. - Hospital care is used where there are serious physical problems or risk to life [2].

Living with bulimia nervosa

Regular eating is the foundation of every recommended treatment and the part that most directly interrupts the cycle. NICE puts it first in CBT-ED, before work on shape and weight [1].

Book a dental review and say why you are there. Dentists see the effects early, and NICE recommends regular dental and medical reviews for people who purge [1].

At work or university you need not disclose a diagnosis, though doing so lets you ask for adjustments such as protected time for appointments.

Telling one person is often the hardest and most useful step, because secrecy keeps the condition hidden from people who could help [6]. Beat runs helplines, webchat, email support and online groups, and lists local services [2][5]. For children and young people, NICE says to consider support for family members who are not involved in the family therapy, to help them cope with the distress [1].

When to speak to a professional

See a GP if you think you might have bulimia nervosa, or if treatment is not helping [2]. Do not wait until it gets worse: NICE says people should be assessed and treated at the earliest opportunity [1].

Seek urgent advice through NHS 111 or your GP if you feel physically unwell, faint or weak, or are worried about your heart. Bulimia nervosa can cause serious physical complications [6].

If you are in crisis or thinking about harming yourself, call Samaritans on 116 123, free, 24 hours a day, or text SHOUT to 85258. Call 999 if anyone is in immediate danger. Beat’s helpline is open 3pm to 8pm, Monday to Friday [5].

Common questions

Can you have bulimia nervosa without being underweight?

Yes, and most people with bulimia nervosa are not underweight [6][8]. NICE tells services not to use single measures such as body mass index to decide whether to offer treatment [1]. Not being underweight makes it neither less serious nor less treatable.

Is bulimia nervosa curable?

Beat states that eating disorders are treatable, that full recovery is possible, and that many physical effects can be reversed or stopped from worsening with treatment [6]. Outcomes are better than for anorexia nervosa, which NICE links to a high mortality rate [1]. Relapse can happen [1].

Can you refer yourself to an eating disorder service?

The usual NHS route is through a GP, who can refer someone to an eating disorder specialist or team [2][4]. Some areas accept self-referrals, so local services are worth checking. Beat’s helpline can help with finding out what is available [5].

Clinical review pending

References

1. National Institute for Health and Care Excellence. Eating disorders: recognition and treatment. NICE guideline NG69, 2017. https://www.nice.org.uk/guidance/ng69/resources/eating-disorders-recognition-and-treatment-pdf-1837582159813
2. NHS. Overview: Bulimia. NHS, accessed August 2026. https://www.nhs.uk/mental-health/conditions/bulimia/overview/
3. NHS. Symptoms: Bulimia. NHS, accessed August 2026. https://www.nhs.uk/mental-health/conditions/bulimia/symptoms/
4. NHS. Treatment: Bulimia. NHS, accessed August 2026. https://www.nhs.uk/mental-health/conditions/bulimia/treatment/
5. Beat. Helplines. Beat Eating Disorders, accessed August 2026. https://www.beateatingdisorders.org.uk/get-information-and-support/get-help-for-myself/i-need-support-now/helplines/
6. Beat. Bulimia. Beat Eating Disorders, accessed August 2026. https://www.beateatingdisorders.org.uk/get-information-and-support/about-eating-disorders/types/bulimia/
7. Beat. How many people have an eating disorder in the UK? Beat Eating Disorders, accessed August 2026. https://www.beateatingdisorders.org.uk/get-information-and-support/about-eating-disorders/how-many-people-eating-disorder-uk/
8. Mind. Types of eating disorders. Mind, accessed August 2026. https://www.mind.org.uk/information-support/types-of-mental-health-problems/eating-problems/types-of-eating-disorders/
9. NHS England. Children and young people’s eating disorders. NHS England, accessed August 2026. https://www.england.nhs.uk/mental-health/cyp/eating-disorders/