Hi, I normally recommend post-surgical patients contact their surgeon with any new postoperative symptoms. But headaches are generally a primary care issue and usually associated with tension or migraines which is certainly plausible for you given the position your head was probably in during your several hour surgery. Your headaches sound a little more concerning to me without a headache history. You should be concerned for blood clots which are always a postoperative concern. I would recommend urgent evaluation to rule out the more dangerous cause. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. David Hoch, Internal Medicine Specialist