Medication overuse headaches or rebound headaches are caused by regular, long-term use of medication to treat headaches, such as migraines. Pain relievers offer relief for occasional headaches. But if you take them more than a couple of days a week, they may trigger medication overuse headaches.
Reference : By Mayo Clinic Staff, https://www.mayoclinic.org/diseases-conditions/medication-overuse-headache/symptoms-causes/syc-20377083 , july 1st,2019
