I am an MD board certified in clinical medicine and in integrative medicine, and I have worked with chiropractors for many years. I will give you an answer: let me know if you have questions.
Yes it can.
This can be temporary and not serious.
Or, it can be serious.
In the case that the adjustment has aggravated a problem at the very top of the spine, which impinges on the vessels carrying blood into the brain, then this can be a big problem.
I would be examined immediately , even in urgent care, if this happened.
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