Migraines are recurrent moderate to severe headaches. They often affect one side of the head and can be accompanied by nausea, and light and sound sensitivity. It is a neurological disorder.
History
Dr. Cole had a bad migraine during the mandatory rest day established by Dr. Kate Heightmeyer. She took some stuff but was on call that day, so she hadn't taken any more for it. When Dr. Carson Beckett learned about it, he took her shift and told her to take a pill and rest. (SGA: "Sunday")
Dr. Rodney McKay has mentioned that he's had some pretty horrendous migraines before. (SGA: "Ghost in the Machine")
When Marie contacted Jennifer Keller, (who was actually Neeva Casol at the time), about an emergency involving Dr. Radek Zelenka having been seriously injured, Rodney questioned if it involved Radek "complaining about another one of his so-called migraines". (SGA: "Identity")
Dr. Elizabeth Weir described being stuck in subspace as constant motion, deafening noise and that it was like the worst migraine you could imagine. (SGA: "Ghost in the Machine")