There are a few ways potentially, between head-first or gut-first. Gut problems like from bad microflora due to taking antibiotics, or eating something inflammatory makes your system pressure go up and can cause headaches and migraines, also hurt tummies of course. In some cases of headache-first, the area if your brain that experiences the headache is close the the zone that perceives gut pain, and it can feel like you’re sick even when nothing’s wrong. Also the vertigo/dizziness aspects others mentioned.
Technical reference: https://thejournalofheadacheandpain.biomedcentral.com/articles/10.1186/s10194-020-1078-9
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