Cardiac tumors are a rare pathology with an approximate incidence of 0.02% in the general population. Most of these tumors are benign, and the atrial myxoma is the most common type in adults with a predominantly endocavitary location. We present the case of a 24-year-old woman with a three-year history of worsening postpartum lower extremities edema treated conservatively, who recently developed exertional dyspnea and nonproductive cough. Exacerbation of exertional dyspnea, and appearance of orthopnea, generalized edema, ascites and tachycardia brought her to the Emergency Department. A transthoracic echocardiogram and subsequent emergency surgery confirm the diagnosis of left atrial myxoma. After a complicated postoperative period, the patient makes full recovery. Even though edema during and after pregnancy is a common finding, expected physiological adaptations during this period can mask underlying causes. For this reason, persistent edema should invite for a full evaluation of possible etiologies that would assure a timely diagnosis and prevent the need for emergent surgeries and management.