Does your cat hate going to the vet? Many cats do.
I think it is partially the experience of getting into the pet carrier and the car ride followed by the overwhelming smells and noises at the veterinary clinic. You combine all these things together and it's easy to see why many cats are afraid.
Is there anything you can do to help? Yes! This article has some great tips to help make your cat's vet visit a lot more pleasant (and less stressful). Go to: How to Have a Trauma-free Veterinary Visit.
Have you ever thought about sedating your cat for a vet visit? There are some pros and cons, but generally I don't recommend it for most cats. For tips, go to: Pros and Cons of Sedation for Your Cat.
Some cats get car sick. If your cat is one of them, this article may be helpful. Go to: Motion Sickness in Cats.