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Idiopathic intracranial hypertension (IIH) is defined by elevated intracranial pressure and associated headaches, changes in vision and pulsatile tinnitus, among other symptoms. It occurs most frequently in young, obese women. Gastric bypass surgery has been used to treat morbid obesity and its comorbidities, and IIH has recently been considered among these indications. We present a case report of a 29-year-old female with a maximum BMI of 50.3 and a 5-year history of severe headaches and moderate papilledema due to IIH. She also developed migraine headaches. After a waxing and waning course and various medical treatments, the patient underwent laparoscopic Roux-en-Y gastric bypass surgery with anterior repair of hiatal hernia. Dramatic improvement in IIH headaches occurred by 4 months postprocedure and was maintained at 1 year, when she reached her weight plateau with a BMI of 35. Presurgery migraines persisted. This adds to the small number of case reports and retrospective analyses of the successful treatment of IIH with gastric bypass surgery, and brings this data from the surgical literature into the neurological domain. It offers insight into an early time course for symptom resolution, and explores the impact of weight-loss surgery on migraine headaches. This treatment modality should be further investigated prospectively to analyze the rate of headache improvement with weight loss, the amount of weight loss needed for clinical improvement, and the possible correlation with improvement in papilledema.