Understanding the causes and symptoms of motion sickness

Motion sickness, including car sickness, is caused by a sensory conflict between the inner ear and the eyes. While the inner ear detects movement such as acceleration or turning, the eyes may perceive a stationary environment, such as a car interior or a book. This mismatch can lead the brain to interpret the inconsistency as a sign of poisoning, triggering nausea to purge the system.

Research suggests that the condition may also stem from a mismatch between what the brain expects to sense and what it actually detects. Drivers are less susceptible to motion sickness because they anticipate movement and maintain a fixed visual reference point on the road. In contrast, passengers who focus on screens or reading are at higher risk.

Certain demographics, including children between ages two and twelve and young dogs, are more prone to these symptoms due to the ongoing development of their vestibular systems. Symptoms typically include dizziness, warmth, sweating, headaches, and fatigue, which can progress to vomiting.