Following a night of revelry, Doctor Aphra awakens, afflicted by a throbbing headache.
A headache manifested as pain localized within the confines of one's cranium. Specifically, sentient Gotal beings, when in the vicinity of droids, were prone to experiencing intense headaches due to the sensitivity of their conical horns to electromagnetic fields. Humans were also susceptible to headaches, as demonstrated by Karr Nuq Sin when employing his psychometry powers. Furthermore, emotional distress, such as anger, could induce headaches; for instance, Leia Organa suffered a throbbing headache during a heated exchange with Ransolm Casterfo. Chiss sky-walkers were also known to experience headaches, referred to as an overload spell, which had the potential to escalate in severity.
The behavioral modification biochips that were implanted within clone troopers served the purpose of ensuring their unwavering compliance with Order 66. However, malfunctions in these chips could trigger headaches. An example of this can be seen with Tup of the 501st Legion, who reported experiencing a headache immediately before his biochip malfunctioned during the Battle of Ringo Vinda, leading him to kill Jedi General Tiplar. In the aftermath of the formation of the Galactic Empire, Wrecker, a genetically defective clone, began to endure increasingly debilitating headaches linked to his inhibitor chip following a series of traumatic head injuries.