Headaches are the most common symptoms in which patients present to the neurologist OPD. Many patients don't like painkillers as they can cause gastritis or kidney or liver problem. Sphenopalatine ganglion block (SPG block) is a nervous system structure that is situated deep inside the nasal areas. The SPG block has been used for a long time for treating headaches of varying etiologies.br br Dr. Pravin Thomas, Consultant - Neurologist and Headache Specialist at Narayana Health City, Bangalore talks about SPG block procedure for treating headaches.