An average person has an INR between 0.9 and 1.1, so you were basically at a level like you aren't taking any medication--just like you were before you clotted at all.

Are you on warfarin? If so, you need to talk to your doctor about your levels. 0.9 is waaaay too low.

Why is your INR so low? I don't think that's causing your headache. Like Toss said, people who aren't on warfarin would have that INR, and aren't suffering headaches as a result.

Are you fighting a sinus infection or some kind of virus, or not eating enough? Those things can mess with your INR and contribute to a headache

I have been very stable for 6years now since PE taking 5-7 mg a day and was at Doctor a week ago with a 2.0 reading. Having Factor V Leiden I get checked monthly. The ER Doctor said there are No signs of you taking Coumadin it freaked me out since I only had one previous low reading a few years ago. I have fibromyalgia and was trying to rule out a few things. I took some Tylenol flu meds and it seemed to clear the headache up and pressure. I have no signs of flu or stuffed up nose but it seemed to help. My appetite has been really bad from other pain issues going on so I think not eating and a combination of a few other things probably caused it. Seeing my doctor on Saturday for blood tests again. I never had experienced headaches like this before just going down the list of possible issues. I keep track of my Coumadin everyday on a calendar so it freaks me out to have that low of a reading. Thank you so much for your replies.

I've had a headache and sinus pressure on and off for almost a month now. And some people at work are having the same issue so I think there's either stuff going around or it's allergies. The other day I had to just cover my forehead and the back of my neck in ice packs because it was the only thing that helped take the edge of the headache. If I sat up, I got nauseous and dizzy. Anyway, bad headaches are the worst because they seem to affect your entire body.

But yeah if you're taking over the counter meds, fighting a bug and not remaining consistent with your diet, which would include decreased calories, that could totally affect your INR. When I was on warfarin, I'd be stable for months and they all of a sudden it would drop or get super high, sort of out of no where. It's unnerving for sure.

Take it easy and hope you start feeling better!

I have had sinus pressure since last week and my nose is either draining or stuffed up.
@rmb what is safe to take to help alleviate this when on blood thinners? I called my PCP but she doesn't answer ANY questions over the phone she makes you come in and see her. This was great as she saved my life when I had a PE but not so great for just a stuffy nose.

@renaec23

Call your pharmacist and ask him/her. They'll know what you can take and what you can't. Plus, no wait or co-pay!

Yeah, I agree to check with your pharmacist. I take sudafed or mucinex and tylenol. None of those affected my INR when I was on warfarin. I'm on xarelto now, and to be honest I didn't think about whether they would interact. I assume not.

I can't remember if you're on warfarin or not, but warfarin is usually the concern with other medications because of the affect to your INR. For the new anticoagulants, I suspect the only known or documented interactions are with NSAIDs, due to risk of bleeding, which is the same for warfarin, but definitely ask your pharmacist.