What is the primary cause of a stroke?

• A. Hemorrhage from a blood vessel
• B. Ischemia due to a blockage of blood supply
• C. Infection in the brain
• D. Physical trauma to the head

Answer: (B)

The primary cause of a stroke is ischemia due to a blockage of blood supply. This condition occurs when a blood vessel supplying oxygen and nutrients to the brain becomes obstructed, which can lead to brain cell damage and potential loss of neurological function. The most common type of stroke, ischemic stroke, typically results from a clot that forms in the arteries leading to the brain or from a plaque buildup (atherosclerosis) that narrows the vessels. This blockage prevents the adequate delivery of blood, which is critical for brain health, ultimately causing the affected area of the brain to start dying.

In contrast, hemorrhagic strokes, caused by the rupture of a blood vessel leading to bleeding in or around the brain, represent another type of stroke but are not as common. Infection in the brain, such as meningitis or encephalitis, does not typically result in a stroke. Similarly, physical trauma to the head can cause various types of brain injuries but does not directly cause strokes; instead, it may lead to secondary effects like hemorrhage. Thus, ischemia due to a blockage stands out as the primary cause of stroke, highlighting the critical need for maintaining healthy blood flow to the brain.