Objective: A seemingly endless list of symptoms and conditions are being labeled as long COVID or post-COVID syndrome, but not everything that happens after a COVID-19 episode can be attributed to it. We hereby present a clinical case in which pheochromocytoma was masquerading as long COVID. Design and method: Review of the patient's clinical record and the relevant literature. Results: A previously healthy, non-smoker, 57-year-old woman was admitted in October 2020 with fever, dyspnea and asthenia. She was diagnosed with SARS-CoV-2 bilateral bronchopneumonia and required oxygen therapy but not assisted ventilation or intensive care. Three months after discharge the patient was asymptomatic but in the two following years she progressively developed symptoms of confusion, dizziness, inability to concentrate, gait instability, tachycardia, palpitations, anxiety and insomnia. The syndrome was labeled as post-COVID and in March 2022 began treatment with alprazolam and propranolol. Subsequently she complained of severe non-pulsatile holocranial headache accompanied by vertigo, nausea and skin pallor. In October 2022 she was admitted in Emergency Care with a BP reading of 226/118 mmHg, HR 132 bpm, ECG: sinus rhythm without repolarization anomalies. She was referred to our Outpatient Hypertension Clinic for workup of suspected secondary hypertension. Physical exam: BMI 27.3 kg/m2, BP 156/94 mmHg, FC 112 lpm, normal cardiopulmonary auscultation, no murmurs or oedema. Lab: Plasma glucose, ionogram, lipid profile, blood count, free T4, TSH, aldosterone, renin, ARR, NT-pro-BNP: normal, metanephrines 876/1238 pg/mL, albuminuria 56 mg/g Cr. Echocardiography: slight LVH (13 mm septum and posterior wall) with preserved function. Abdominal CT: Left adrenal mass, 54 mm, hyperdense, heterogeneous. MIBG scintigraphy: hyperintense left adrenal uptake without additional anomalies. After standard presurgical conditioning the patient underwent laparoscopic adrenalectomy, uneventfully. Pheochromocytoma was pathologically confirmed, without suggestion of malignancy (Ki-67 <2%). Three months afterwards the patient is normotensive and asymptomatic without medication, with normal plasma metanephrines. Conclusions: The clinical presentation of pheochromocytoma may be atypical and sometimes bizarre. Sustained hypertension may be absent, but the paradoxical hypertensive response to beta-adrenergic blockade is highly suggestive. Anyhow, a ‘post-COVID syndrome’ label may be masking unrelated and solvable serious diseases.