@janbb: The reason we get more sensitive is mostly due to the adage: “If you don’t use it, you lose it”. Had we continued tumbling, swinging, flipping and riding roller-coasters like we did in our youth, our inner ear (labyrinth) would still be accustomed to such rapid position changes. But as we get older, most of us become increasingly more sedentary, or even those of us that are active tend to stick with exercises that don’t task the vestibular system that much (e.g. bicycling, running, aerobics).
@aprilsimnel: You’re still relatively young… keep active so that your system will sustain a comfort level with those types of movements.
And yes, there are medical conditions (genetic, congenital, or illness/medication related) that can contribute to motion sickness – which is what most of the above respondents describe. Many people with motion sickness also have migraine headaches or migraine aura without headaches.
People who have had ear pathology in the past, such as labyrinthitis or inner ear infection, are also prone to having residual issues with dysequilibrium and motion sickness. There are also chronic conditions, such as Meniere’s Disease, that cause people to have acute attacks of vertigo and/or lingering balance problems.
There is also a high correlation between anxiety and vestibular symptoms. Sometimes it can be difficult to tell which is the primary issue.
If anyone suspects that they have an inner ear illness or disorder – especially if your dizziness is accompanied by hearing changes, tinnitus (sounds inside the ear or head), headache, pain or fever – please consult an Ear specialist, who will order testing of your hearing and vestibular system. If there are associated heart palpitations, shortness of breath, vision changes, or loss of consciousness – get to the Emergency Room, or if you are not currently having symptoms see you Primary Physician as soon as possible.