This document describes the case of a 22-year-old female who presented with 1 month of left upper limb pain. On examination, she had absent left radial pulse and diminished left brachial and ulnar pulses. Tests showed elevated ESR and stenosis of the left subclavian artery on arterial Doppler. She was diagnosed with Takayasu's arteritis based on meeting criteria including age less than 40 and arterial narrowing. She was treated with steroids and methotrexate, which improved her symptoms, and later underwent stenting of the left subclavian artery. Takayasu's arteritis is an inflammatory condition involving medium and large arteries that commonly affects young females and can cause limb ischemia.