The most common complication of migraine is Medication Overuse Headache. 

A migraine crisis occurs when symptoms become severe or unusual, surpassing the threshold of what can be managed at home.

In rare cases, migraine can lead to serious complications that require urgent medical care. These include:

• Status migrainosus: A debilitating attack lasting more than 72 hours.
• Persistent aura without infarction: Aura symptoms that persist for over a week without evidence of brain damage on imaging.
• Migrainous infarction: Aura symptoms associated with an ischemic brain lesion detected on imaging.
• Migraine aura-triggered seizures: Seizures occurring during or after a migraine with aura.

These complications highlight the importance of seeking emergency care during a migraine crisis.