by Guy Morris Anyone that has ever traveled knows what motion sickness is. Many may have experienced it at one time or another, whether traveling by land, sea or air. Motion sickness can be different with different types of travel, but the most common type of motion sickness is seasickness. Seasickness, characterized by nausea and lightheadedness, is very common when traveling on a ship. A person may enjoy traveling by sea but still experience seasickness, caused by the motions made by the boat swaying through the waves. In addition, their bodies are not conditioned for the different movements it's going through while on the ship. For some individuals, the boat doesn't even have to be moving for them to feel sick. Many start to feel nauseous as they are stepping onto the ship. Becoming seasick isn't very serious, but it can be very bothersome if you have some place to go or something important to take care of while on the ship. The causes of seasickness are movement as well...