"Headache" side effect of a headache relief?

[aimeeandbeatles]

Ok, I was going out to the kitchen, and on moms tv heard an advertisement for a headache reliever. (Didn't hear the brand.) But when they got to the side effect, they go "Side effects are generally mild and include blah blah blah headache blah blah blah."

I'm seriously confused now. Why would a headache be a side effect of a headache relief medication?

 

[El_Machinae]

Headaches can be caused by different things. The headache medication might distress some part of your nervous system which was prone to making a headache symptom.

 

[emzie]

Headaches can be caused by different things. The headache medication might distress some part of your nervous system which was prone to making a headache symptom.

Moreover, a migraine isn't really a classic headache and treatment for them is different than taking a tylenol.

So I imagine that in getting rid of a migraine, you could get a headache. Anyone who's ever had a migraine would agree that's an excellent trade.