Once symptoms hit, it’s fast. Really fast. Many people wake up feeling off, and by lunchtime they’re shivering under a blanket. This isn’t a gradual cold that creeps in over a week—the flu often strikes within hours of the first tickle. That suddenness is a key clue: if you go from “meh” to “call an ambulance” in an afternoon, it’s probably influenza, not allergies.
How long are colds and flu contagious? – – Familiprix
I remember a buddy who insisted he had “just a sniffle.” Three hours later, he was face-down on the couch, whispering, “Tell my cat I love her.” That is the flu’s call time: disrespectfully punctual.
What about the “stomach flu”?
Stop me if you’ve heard this one: someone says they have the flu, but they only vomited. That’s not influenza. Real flu is respiratory—cough, fever, body aches—with maybe some nausea as a side act. The stomach bug (norovirus) has its own incubation: 12 to 48 hours. But don’t confuse them. Please. Your doctor will silently judge you.