I drink 2 to 3 cups of coffee every day and I haven’t had a cup of coffee in a couple of days and my headache wasn’t going away so I had a cup of caffeinated tea and my headache is gone I was having caffeine withdrawal on top of the flu. I think people don’t realize that when they’re sick they stop drinking coffee and that gives them a pounding headache
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The caffeine headache is a result of the blood vessels in your head trying to return to normal size when you stop drinking coffee. Caffeine shrinks the blood vessels in your head and around the second day of no coffee you’ll get the worst headache of your life because the blood vessels are putting pressure on you as they try to return back to normal. Caffeine is not good for you as it results in constricting blood vessels i.e. oxygen flow to the brain. That’s why the headache goes away when you finally have that cup of coffee. They’re shrinking again.
Once you get pass that second day it gets better though. As long as you don’t drink coffee.