A headache was a pain in the head. Headaches were sometimes experienced by humans.
Barbara Wright got a terrible headache while on Skaro. She was initially unaware that this was an early symptom of her radiation sickness. (TV: The Daleks)
The Sixth Doctor woke up with a headache after being hit with a low-level stun blast on Baspral; he said his head felt "like Bourbon Street after Mardi Gras." (PROSE: The Inquisitor's Story)
Evelyn Smythe began suffering from headaches a few days before meeting the Sixth Doctor. (AUDIO: The Marian Conspiracy)
Nina, a school girl, was suffering from a headache before she was eaten by Lassar. (TV: School Reunion)
The glare of the Exhalation's glass surfaces gave Bernice Summerfield a terrible headache. (PROSE: Heart of Glass)
The Twelfth Doctor claimed that Madame Vastra's sonic lanterns were giving a dinosaur a headache. (TV: Deep Breath)