Suffering with a migraine is awful.
Some people suffer from first signals like flashing lights, blind spots scotoma and Visual disturbances.
After those early symptoms go away, people also get inability to think clearly or perform normal activities, sensitivity to light, noise and smell, pain in the sinuses or neck,dehydration, thirst or pain on one side (may swap sides). Not all of the symptoms are always present.
A ton of different things will precipitate a migraine in people who get migraines. For example...