Clinical subtypes of headache in pSS patients.

Legend: migraine without aura - MWO (Migraine without aura), migraine with aura - MWA (Migraine With Aura), chronic migraine - CM (Chronic Migraine), episodic tension-type headache - eTTH (episodic Tension-Type Headache), headache chronic tension-type headache - CTTH (chronic Tension-Type headache); analgesic overuse headache - MOH (Medication overuse headache).