You guessed it – seasickness!
Yes, it can certainly put a damper on your cruise vacation. Although not fatal, it’s still not pleasant and is the #1 reason people choose against cruising on their vacations.
Seasickness, as with all kinds of motion sickness, is theorized to be a result of the disorientation caused by the natural desire of our body to remain in balance (a function of our brain working with our eyes and our ears) competing with the motion of the moving object we are in (car, bus, ship).
If this is the technical cause or not, being in a car or bus that is travelling on winding roads and up and down hills, or on a rough and rocking sea, can leave some travellers feeling under the weather and less than their best. Oddly enough, there are others who don’t feel the effects at all, no matter what!