Having a migraine is a terrible experience.
Common symptoms are initial indicators for example blind spots scotoma, wavy lines and flashing lights.
Around the time of the initial symptoms, other symptoms follow such as dehydration, thirst, pain in the sinuses or neck, sensitivity to light, noise and smell,loss of concentration or inability to think clearly or perform normal activities. It's not the case that all symptoms have to be present.
Different triggers can cause a migraine in people who get migraines. For example...