Is it normal to have headaches 3 days post op?

Yes this is a common complaint and is often due to dehydration. Ensure that you drink plenty of fluids. You need to see a doctor if the headache persists beyond a week.

Yes, it is normal to have
headaches 3 days post-op. Common causes include dehydration or a side effect of
the painkillers you are taking. If the headaches go away on their own, I would
not be concerned. If they get worse, contact your surgeon. Best regards.

Anesthesia and surgery has many effects on people. While most of the effects of anesthesia are felt in the first day or two after surgery, such as nausea and vomiting if you are unlucky enough to develop them, some linger for a few more days. It is also common for patients to be dehydrated after surgery, which can contribute to headaches, migraines, etc. Make sure to stay well hydrated and rest up during the first week after surgery. Don't do anything strenuous. It's possible that the headache was a reaction from the pain medications, though it's not a particularly common reaction from pain meds that I see. Neck positions and tightening in the neck can also lead to headaches by irritating the nerves in the neck that give sensation to the top of your head. Try a different position or use pillows or something else to get more comfortable. Try taking some NSAIDs (such as ibuprofen) to see if the headache goes away. Either way, it should get better soon!
-Dr. David Mattos, New York Plastic Surgical Group

If you feel better, that's great - the most likely culprit is a combination of dehydration and pain meds. Another possibility is a migraine, which can also be brought about by either of the above causes. If the headache is worse than the pain of surgery, you should try to scale back on your use of narcotic meds as soon as you can, and try to take them mostly before you go to bed. Alternatively you can try a muscle relaxant (such as cyclobenzaprine or hydroxyzine) + tylenol instead of any narcotics, and make sure you stay well hydrated. This should most likely be a temporary problem. 

It could be related to the anaesthetic you had or dehydration but it should improve as the time goes with some simple pain relief as directed by your surgeon. If the headache is the key problem that is improving the surgery must have gone very well and that's fantastic!
Wish you all the best in your journey.
Dr Leo Kim, Specialist Plastic Surgeon in Sydney

Hi and thank you for your question.  Headaches are fairly common post-surgery and can be the result of slight dehydration or a medication side effect.  Because you are stating that it is a severe or pounding headache that lasted all day, I do think that you should check with your plastic surgeon just to be safe.  All my best.

Thank you for your question. It is not normal to have a severe headache starting 3 days after surgery. What type of surgery did you have? What type of anesthesia did you have? How long was the surgery? Answers to these question will help us give you an explanation. If it is reducing with you lying in your comfortable bed there much less reason to worry about it. I will highly recommend that you see your primary care physician so that a more thorough history can be obtained and combined with an examination a more likely cause for the headache can be explained to you. If the headache is still persistent  then some test may be needed. Tylenol(Acetaminophen) which is a component of Percocet can often cause a "Tylenol" Headache. More information is needed to determine one is not missing a rare cause of the headache. Please see your PCP for a fuller evalustion.