Diaphragmatic hernia of an idiopathic cause is a rare pathology that occurs due to absence of any trauma or congenital cause. The aim of the study was to report a case of left-sided diaphragmatic hernia without traumatic aetiology. A 59-year-old male had complained of epigastric pain, vomiting, nausea, and breathing difficulties for the past 15 days. After investigations and diagnosis of the condition, the patient subsequently underwent laparotomy surgery to repair the defect. Outcome measures like FIM, NPRS, Incentive Spirometry, ICU-MS, CPaX, and HADS were used to assess the recovery of the patient. Surgical management of the condition was achieved, but to bring the patient back to his pre-pathology life without signs of breathlessness, and fatigue, a comprehensively designed physiotherapy rehabilitation is very beneficial. Our case report is the first-ever report made on physiotherapy management of diaphragmatic hernia after surgery. Tele-rehabilitation had been absolutely vital in patient follow-up.