If my INR falls too low (for me) I get certain symptoms. So when, recently, I had marked tinnitus, dizziness, etc, I thought that must be the reason. An INR test 4 days later showed just the opposite - my INR was up at 4.6. Is this quite a common phenomenon? I seem to recall having read previous posts to this effect; that a too high INR (aside from any risk of bleeding) can provoke a return of symptoms. But perhaps I imagined it!