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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
What Causes Sudden High Blood Pressure? High blood pressure is usually caused by many inappropriate practices and habits in our daily life. Some of these are: Medication use. Overuse of certain drugs can increase your blood pressure, for instance, NSAIDS such as ibuprofen and aspirin. In addition, taking birth control pills and several other drugs together can also cause an increase in blood pressure unexpectedly.