Is the headache associated with encephalitis generally continuous once it starts, or can it come and go?

Most online resources mention headache and fever as symptoms, but they don't mention if the headache comes and goes throughout the day, or if it is a continuous pain.

I'm curious if the headache associated with encephalitis (particularly herpes simplex encephalitis, but also for the general kind) can come and go throughout the day, or if the swelling of the brain results in continuous head pain and/or fever, regardless of what else is going on externally.

There are lots of different types of encephalitis. And as you noticed, most resources simply list "headache" as a symptom. Although, I might add that, at least for some types of encephalitis, it's typically a headache that is severe enough to bring people into the ER [1].

With rabies, the headache is continuous [2].

I found one case report of a women who presented with continuous headache (as well as other symptoms), and the differential diagnosis in the article includes multiple types of encephalitis [3].

That's about all I could find. Hope that helps.

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