Which of the following is the most common symptom of hypertension?
a. shortness of breath
b. tightness in the chest
c. headaches
d. none of the above user: why is high blood pressure known as "the silent killer"?
a. it generally shows no symptoms.
b. it kills people while they sleep.
c. it generally increases the risk of heart attacks.
d. it kills by cutting off the airways.

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