[majiy]

Strange how this has so many different kind of triggers for different people. Makes me wonder if this really one phenomenon, or multiple with similar symptoms.

For me, it took years to identify two triggers: Relieve from stress, and overly exhausting sports or sauna. I used to have a stressful job, and regular intensive training on sunday mornings, and would very often get migraine at exactly 4pm. Since changing the job and doing moderate sports, it became much more infrequent.

Also, I have never had an optical aura. But I have observed yawning, and an increased sensitivity in my nasal passages (basically I feel every breath much more detailed, but not painful) as forewarnings.

[elric]

"Triggers" are a red herring, there's way too much focus on them. The trigger is merely the final straw, the real problem is everything that came before.

[balder1991]

Many people say one cause may be electrolytes imbalance, which would explain the migraines after intensive sports.