A reflex headache, commonly known as a rebound headache, is a type of headache that occurs as a result of medication overuse. When painkillers are taken frequently or in high doses, the body can become accustomed to them, leading to a worsening of headaches. These headaches typically intensify once the effects of the medication wear off, creating a vicious cycle. Some synonyms for reflex headache include medication-overuse headache, analgesic rebound headache, and drug-induced headache. It is essential to break this cycle by gradually reducing the consumption of painkillers and seeking alternative treatments to alleviate the underlying causes of headaches, such as stress management and lifestyle changes.