Severe/massive ischaemic stroke is difficult to treat and has poor prognosis. There are limited studies for specific treatment of these conditions and no consensus on their definitions. This proposal suggests definitions and a flowchart for the diagnosis and treatment of these conditions. We focus on predicting and preventing malignant oedema at an early stage, monitoring the level of consciousness and vital signs, and the prevention and management of complications (eg. pulmonary infections). We particularly provide suggestions for the treatment with intravenous thrombolysis, endovascular treatment, antiplatelet and anticoagulation. More studies are warranted to support individualised management of infarct swelling, intracranial hypertension and early rehabilitation for severe/massive ischaemic stroke.