Which of the following are types of headache classified by the International Headache Society
Which of the following are types of headache classified by the International Headache Society (IHS)? (Select all that apply)
A. Migraine
B. Tension-type headache
C. Cluster headache
D. Sinus headache
E. Medication-overuse headache
Answer: ABCDE
Explanation: The IHS classifies headaches into primary (migraine, tension-type, cluster) and secondary (sinus, medication-overuse, headache due to trauma/infection) types. All listed options are recognized by the IHS classification system.

