Boerhaave's syndrome (BS) is a rare spontaneous perforation of the esophagus with a high rate of morbidity that results in death in the case of delayed diagnosis and treatment. Here, we describe a patient with achalasia who was diagnosed with BS. This present case is a 63-year-old man with a previous history of achalasia and with a complaint of sudden onset of severe right chest pain, epigastric pain, etc. to Razi hospital, Rasht, Iran in March 2022. Due to the clinical findings of the patients, the diagnosis was BS and the patient's condition was reported to be good at the two-month follow-up. Early diagnosis of BS results in more effective treatment. Also, stenting is suggested to be effective to reduce the rate of morbidity and mortality in patients with BS.