One thing I've noticed over the course of my Lyme Disease sufferings, is that I will suddenly get an urgent and curious case of the hiccups every now and then. I'll go for a week or less where I get hiccups MANY times a day that will last what feels like forever, and range in severity (these weeks come often spread very far apart, up to 5 weeks apart from each other). They are very annoying and pesky, and everyone has different ways to relieve such spasms. I call it a spasm (because I know there are wide varieties of spasms caused by Lyme Disease), but really as much as I'd like to think that it's a spasm of the diaphragm (or the muscle right beneath the lungs that flexes to cause breathing) it is a much more uncontrollable and widespread motion. I was very curious about this subject, so I did some research which led me to a very interesting and informational article: http://www.scientificamerican.com/article.cfm?id=what-causes-hiccups
This article speaks of what causes hiccups, what is a hiccup, and gives a very detailed and helpful idea on the layout of the hiccup. Hope it helps you some!