How do the blood vessels get blocked?

How do the blood vessels get blocked?
As a person grows older, the blood vessels become stiff and lose their elasticity.
Eating fatty foods or lots of oily, fried items causes high quantities of fats in the
blood. These fatty substances get deposited inside the blood vessels. This can
cause a partial or complete blockage. The early sign is the person having chest
pain upon exercise. If this happens, he/she must be taken to the hospital or clinic
immediately.
Cerebro-Vascular Accidents (Stroke)
This is a disease in which the blood supply to the brain is suddenly reduced. This
can happen in two ways:
1.Blood supply gets blocked.
2.A blood vessel bursts and there is bleeding inside the brain
3.When this happens, the side of the brain supplied by the vessel stops
functioning and the opposite side of the body gets weak or paralysed. The
person is said to have a ”stroke”. He/she also has:
4.Convulsions.
5. Sudden unconsciousness.
6. Weakness of one side of the body.
The person must be taken to the hospital immediately for investigations and
treatment.
Effects of the stroke: The person will have:
7. Paralysis of one side of the body or of both legs.
8.Inability to speak.
9. Mental slowness.
10.Semi-consciousness and inability to recognise people.
based on WHO