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"What in - Kenobi, are you sick?"
"No. A headache. It's nothing."
"It's not nothing. You look like you're about to retch."
Bail Organa and Obi-Wan Kenobi[1]
A young  with a severe headache.

A young Odion with a severe headache.

A headache described a pain in the head that was experienced by a sentient being, such as humans[2] and Gands.[3]

If there was a trace of ammonia in a breathable oxygen atmosphere, it could cause beings to develop headaches. After she and her Rebel compatriots were rescued by Zuckuss and 4-LOM, Toryn Farr suffered from a headache while on the Mist Hunter, as a small amount of ammonia had remained in the air of the bounty hunters' ship after it was replaced by oxygen.[2]

Strong sunlight and loud noise would sometimes cause headaches as well,[4] as could lack of sleep.[5] Pressure to the skull could also lead to headaches,[6] as could a concussion.[7] The Sith Lord Odion suffered from debilitating headaches during his childhood years, caused by his hypersensitive Force connection.[8]

Commercial headache remedies,[9] in the form of painkillers[1] could be swallowed dry or taken with liquid, and could cure a headache.[9] One type of headache remedy was a special type of white tablet taken with a glass of water.[10] Capsules were another type of painkiller.[7]

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