If you experience a sudden severe headache with no known cause, you could be having a. a stroke. b. a heart attack. c. an asthma attack. d. a diabetic episode.

If you experience a sudden severe headache with no known cause, you could be having a stroke. Correct A

Strokes occur when blood flow to the brain is interrupted.People often describe a stroke headache as the "worst of my life" . However, the headache will typically occur with other characteristic symptoms, including: weakness on one side of the body , numbness on one side of the body ,  loss of balance...