The phrase "massive headache" refers to a very intense and strong pain in the head.
Sentences with «massive headache»
While it might be all the rage with clients, it can sometimes cause massive headaches for ecommerce store owners if you do not have exact costs for your products. (shopifynation.com)
I used to do that years ago, and I'd wake up with massive headaches. (fortydaysofdating.com)
There was even one cleanse diet I couldn't finish because I got massive headaches. (theholisticmama.com)