How worried should you be with a 3-day headache that won't go away?

It depends on a number of things.Have you hit your head?Did it just come out of the blue? Are you taking meds to try and get rid of it? If you have taken alot of Tylenol or ibuprofen you could be into a rebound headache caused by the pills.Sometimes there is a flu that can come with a 3 or 4 day headache.Try an ice pack and lay down for a couple hours in a quiet dark room.If you haven't taken any pills take 2 extra strength(500mg) Tylenol or ibuprofen and do the ice pack and lay down.Also dehydration can cause a terrible headache so make sure your drinking lots of water.But you should be checked out anyways to rule things out.Try and go to a Dr. if you can.Best of luck!

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once i had a headache for 4 days, after trying every over the counter medicines, i gave in and went to the doctor, she said i had a sinus infection, and told me to go to the vitamin shoppe and get this over the counter nose spray called "nasal spray with GSE" it did the trick.

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You could also be suffering from cluster headaches. Migraines are usually very severe and light or noise bothers the person and they need to be in a dark and quiet room and just rest. It's best to let your doctor make the diagnosis.

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Although these are all good suggestions there can be something much more medically serious going on here. If you are able, check your blood pressure. Also look for symmetry in the face and ask people who are around you all the time to see if they noticed you have been acting "a little off" recently. Either way you should definitely go see your MD. He/She might want you to follow up with a neurologist or possibly get an MRI of your brain