In the early postpartum period, acute life-threatening problems can occur and cause maternal morbidity and mortality. In the present case report, a 19-year-old primipara had undergone caesarean delivery following which she developed breathlessness, tachycardia and fall in oxygen saturation after 14 hours of surgery. Her Chest X-Ray (CXR) report confirmed a complete collapse of the left lung. Contrast-enhanced Computed Tomography (CECT) of the thorax showed a complete collapse of the left lung due to obstruction at the level of the proximal main stem bronchus. Medical management with mucolytics was administered. The patient showed improvement clinically and a repeat CXR after 24 hours showed normal lung findings with complete resolution of collapse and medical management was continued. The patient recovered progressively and follow-up of the patient was uneventful. This is a rare case of development of respiratory distress and atelectasis, hence proper diagnosis is essential.