Bulimia nervosa is a serious illness, which affects many aspects of a patient's health and well-being. Some associated abnormalities that have been noted in patients with BN include:

Gastrointestinal abnormalities: Several studies indicate that persons with BN often have impairment in feelings of satiety. This may be due to enlarged gastric capacity, delayed gastric emptying, impaired gastric reflex, and hormonal abnormalities. In rare cases, patients with BN may develop more serious gastrointestinal complications, such as gastric rupture or esophageal tear.

Dental problems: Dental erosion is common in patients with BN, resulting from repeat exposure of gastric acid to the teeth.

Electrolyte imbalance: Repetitive vomiting and laxative abuse may lead to electrolyte imbalances, which can result in serious consequences such as cardiac disturbance and edema.

Menstrual irregularities: Even at a normal weight, individuals with BN may experience menstrual irregularities.

Psychiatric comorbidities: Patients with BN have a higher prevalence of anxiety and mood disorders, in particular depression and dysthymia. BNs also have increased incidence of substance abuse and self-injurious behaviors.