It is important not to confuse the Cluster Headache with other headaches (1) , because the confusion is very common among patients but also among general practitioners:

1. The migraine
2. The trigeminal neuralgia
3. Giant-cell arteritis
4. Chronic paroxysmal hemicrania
5. SUNCT syndrome (Short Lasting Unilateral Nevralgiform Headache with Conjunctival Injection and Tearing )
7. 1. Clickable links to the different headaches are cited examples. You can find other descriptions via your favorite search engine.