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Many things can cause headaches such as traumatic injuries, surgical trauma, blood vessel disorders, strokes, dehydration, heat stroke, fevers, vision problems, Allergies, dental and jaw disorders, migraines and stress related problems, side effects from medications, muscle strains like whiplash, ear damage, and, yes, among many additional causes, microbes can cause headaches, too. Some of the types of microbes that can cause headaches are: * Bacteria - for example in bacterial meningitis, sinus infections, ear infections, blood poisoning, etc. * Viruses - for example in common colds, flu, viral meningitis, etc. * Microscopic fungi and their toxins - such as Aspergillus * Microscopic animals - such as dust mites and related allergies * Protists - in protozoan diseases such as malaria, etc.

(see also the related question below for more information on the types of microbes)

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16y ago

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