Migraines are a complex neurological disease brought on by the disorder of the central nervous system. They are severe and recurrent attacks of headache that may occur on any one or both sides of the head, lasting anything between 2 and 72 hours. (1)
Besides the debilitating pain, migraineurs often experience some symptoms that precede and/or last during the time the migraine episode is on. Here’s a list of some of the symptoms a migraineur may experience before or during an attack:
• Nausea
• Dizziness
• Sleep disturbances
• Visual disturbances/aura
• Hypersensitivity to sound
• Hypersensitivity to light
• Increased sensitivity to odors
• Frequent yawning
• Frequent need to urinate
• Constipation
• Diarrhea
• Non-visual aura
• Confusion
• Fatigue
The exact reason why a migraine attack begins is not yet clear to scientists. However, based on years of data gathered from cases that report for treatment assistance to clinics and hospitals, several migraine triggers have been identified.
https://www.empowher.com/migraine/content/menace-migraines-i