Brain blood narrowing refers to intracranial stenosis, a condition where arteries inside the skull become narrowed—often due to plaque buildup—reducing blood flow to the brain and raising the risk of stroke. Symptoms can include sudden weakness, numbness, speech trouble, severe headache, dizziness or vision issues, often signalling a warning of stroke risk. Causes include high blood pressure, high cholesterol, diabetes, smoking and ageing. Treatments range from medicines and lifestyle changes to advanced procedures like angioplasty or stenting to widen vessels — aimed at restoring blood flow and preventing serious complications. With expert evaluation and care by Dr Arvind Nanda, early diagnosis and personalised treatment can help manage symptoms and lower future stroke risk.