Nummular (coin-shaped) headache is an uncommon condition. It is defined as intermittent or continuous pain in a small circumscribed area of the scalp with the following four characteristics: sharply-contoured, fixed in size and shape, round or elliptical and 1-6 cm in diameter. The pain is usually mild or moderate in intensity, but some patients have severe pain. These headaches often occur in patients who also have migraines.
Nummular headaches often respond to ibuprofen, naproxen, and other NSAIDs. Botox injections are also very effective. They provide relief for 3 months, obviating the need for daily medications which are more likely to cause side effects. A very small amount of Botox is needed to treat nummular headaches, so the cost is much lower than when treating migraine headaches.
A case report just published in the journal Headache describes a patient who suffered from migraines and nummular headaches. His nummular headaches did not respond to medications and Botox injections but he had complete elimination of his nummular headaches along with improvement of his migraines after he received an injection of galcanezumab (Emgality).
Galcanezumab and other CGRP monoclonal antibodies have been also reported to help trigeminal neuralgia as has rimegepant (Nurtec ODT), an oral CGRP receptor blocker. It is possible that nummular headache is the result of damage or irritation of a small terminal branch of a nerve. This is suggested by the fact that the pain is invariably superficial. And we know that CGRP is involved in pain messaging along the nerves. So it is not surprising that anti-CGRP drugs can help relieve nummular headaches.
