Neurologists use headache frequency and disability to determine whether preventive (prophylactic) treatment is warranted. Purely acute treatment — taking a pill when the headache hits — is the standard approach for infrequent episodes. But if your log reveals a pattern that crosses certain thresholds, the clinical calculus changes.
Preventive treatment is typically considered when:
→ 4 or more migraine days per month
→ OR 3+ days/month with significant disability (can't work/function)
→ OR acute medication use ≥ 10 days/month for triptans or combination medications, or ≥ 15 days/month for simple analgesics (MOH risk)
→ OR hemiplegic migraine, migraine with brainstem aura, or frequent aura
Your log is the only way to answer these questions accurately. Most people dramatically underestimate their headache frequency when asked without records. A log covering 8–12 weeks gives your doctor a reliable frequency count, a disability picture (via your severity ratings and postdrome notes), and an acute medication tally. That's the difference between "I think I get them maybe twice a month" and a documented case for starting a beta-blocker, topiramate, or a CGRP inhibitor.