Diagnosing and understanding adult headache.

Primary headaches are the most common headache disorders. The most common forms are tension-type headaches, migraine, and cluster headache. Knowing the clinical presentation coupled with taking a thorough history taking and performing a thorough physical examination usually helps in arriving at a correct diagnosis. Special attention should be paid to unusual clinical presentations. Further diagnostic work-up should be performed in the presence of atypical and worrisome signs.