A 70-year-old woman, otherwise feeling well and appearing clinically stable, presented with persistent difficulty measuring blood pressure in her left arm in the last days. She also noted mild sensory changes in the same arm over several weeks but denied pain, weakness, or systemic symptoms. Her overall health seemed unchanged, making the inability to obtain a blood pressure reading her primary concern. This atypical presentation raised suspicion for underlying vascular pathology despite her reassuring clinical appearance. A broad workup was done, and a surprising diagnosis was made.A detailed physical and neurologic examination was performed, revealing subtle asymmetry in the left radial pulse. Blood tests, including CRP and ESR, were normal, and ECG showed no acute cardiac findings. Differential diagnoses included both common vascular conditions such as atherosclerotic subclavian stenosis, subclavian steal syndrome and thoracic outlet syndrome as well as “can’t-miss” diagnoses such as large-vessel arteritis and early aortic dissection. Planned investigations included duplex ultrasonography and  CT angiography. A central challenge was determining whether this workup could safely proceed in an ambulatory setting or required urgent evaluation in the emergency department due to the potential severity of underlying causes.The case underscores the value of integrating careful bedside assessment with advanced imaging to detect uncommon vascular pathology in patients who feel entirely well.This case highlights that even benign-seeming complaints, such as difficulty obtaining a blood pressure reading in one arm, may indicate significant vascular disease. Subtle findings like unilateral blood pressure discrepancies, weak peripheral pulses, or sensory changes deserve thorough evaluation even in well-appearing patients.The primary dilemma involved choosing between ambulatory workup and emergency evaluation. While the patient appeared well, the risk of missing serious disease required careful triage and vigilance.Unilateral blood pressure measurement difficulties warrant a broad differential diagnosis and timely vascular imaging to exclude conditions such as arteritis, subclavian stenosis, or aortic dissection, ensuring safe and effective management.       Keywords:Blood Pressure Determination, Pulses, Giant Cell Arteritis