A: A minor head injury can cause blood pressure to acutely rise. But if it remains high or there are any other concerning symptoms (severe headache, vomiting, loss of consciousness, seizures, differing pupil sizes), then that is an indication for a CT scan of the head to ensure that there isn't a bleed in the brain.
Postconcussion syndrome is not associated with an elevated blood pressure.
A blood pressure of 158/101 is high, but not dangerously high. It could definitely explain the headaches, and should be treated. If BP was definitely known to be normal (120/80) before the injury and the "permanent headaches" are new and severe, then a head CT is definitely worthwhile.
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