If you've never been on a cruise ship, there's a good chance you might suffer from seasickness. Most cruise veterans have it worked out. But newbies sometimes don't, and wind up spending a perfectly good vacation in the lavatory. Seasickness happens when your eyes, inner ear, and other motion-detecting areas of the body send mixed messages to your brain. For instance, if you're in an interior room with no windows you might feel the rise and fall of the waves, but not see the horizon moving up and down. The result is a conflict of the senses.
There are many seasickness remedies you can take once you get onboard that work for some folks. But if you're a cruise newbie, it's not worth the risk because it's a difficult sickness to stop once it's started. Look into seasickness bracelets, patches and prescription drugs like Dramamine, Bonine and Scopace. Talk to your doctor or pharmacist to get a good recommendation before you go cruising and you should be fine. It's typically those who don't think ahead that spend most of their cruise with their head in the toilet.