I posted this on another thread but felt it was good info and should have its own thread. I got this off of mvertigo.org which the poster got it off of Medscape. there are other differences and overlapping symptoms but this is a good place to start. Some comparisons and overlapping symptoms of MM and MAV The overlapping symptoms of Ménière disease and migraine-associated vertigo include episodic vertigo, sensorineural hearing loss, and tinnitus. Differentiating migraine-associated vertigo from Ménière disease may be difficult because of the overlapping nature of the symptoms of these diseases. However, often the patient’s history offers clues that may help make the diagnosis. When vertigo is present, it may be indistinguishable from the spontaneous vertigo of Ménière disease. One clue that the vertigo is not of the Ménière type is that the vertigo of migraine-associated vertigo may last longer than 24 hours. In fact, a rocking sensation may be a continuous feeling for many weeks to months. In contrast, the vertigo of Ménière disease typically does not last longer than 24 hours. Symptoms that would support the diagnosis of migraine-associated vertigo as opposed to Ménière disease include photophobia, nonprogressive sensorineural hearing loss, vertigo of longer than 24 hours in duration, a long-standing history of motion intolerance, and dizziness occurring only during the menstrual cycle. Childhood benign positional vertigo is strongly related to migraine-related vertigo. Migraine and vestibular disease can coexist. Patients who meet the clinical criteria for Ménière disease should be treated appropriately for Ménière disease, even if a history of migraine headache exists