ICHD classification and diagnosis of migraine are further subdivided. Overall ICHD-3 beta distinguishes 29 migraine subtypes. The following table outlines the main subtypes and their ICHD-1, -2, -3 beta and ICD-10 codes. Migraine without aura also referred to as a "common migraine", (previously known as "hemicrania simplex") is a specific neurological disorder characterized by recurrent, throbbing headaches that often affect one side of the head (i.e., it is unilateral), are of at least moderate intensity, and may cause nausea, phonophobia or photophobia. One defining characteristic of the common migraine is a lack of the visual disturbances known as an aura. The exact International Classification of Headache
Affliction (Star Trek: Enterprise) being set prior to "The Original Series". On the episode's script, the old style Klingons were referred to as "type-two" and "semi-Klingons". The storyline was one of several in the fourth season of "Enterprise" which show runner Manny Coto sought to connect the series to "The Original Series". Coto also revealed in an interview with the "Chicago Tribune" that the episode would see the start of Section 31. The episode also featured the first appearance on-screen of the Rigelians, despite first being mentioned in "The Original Series" and again in "DS9". "Affliction" marks the fifth writing credit of the fourth