If you smoke like a chimney, you're going to pay more for life insurance. If you wreck your car, your auto premiums are going to soar. If you live on the edge of a wildfire-prone forest, you'll pay a lot more for homeowners insurance than someone in the suburbs.
All these situations make sense to us consumers. Greater risks, bigger premiums.
But insurers also care about other, seemingly obscure stuff: How you give birth, what you have in your backyard, what breed of dog you own, whether you max out your credit cards and how well your brain works.
If you don't know about these concerns, you may find yourself getting turned down for coverage or paying a lot more than you expect. A little knowledge can help you prepare and find a policy you can afford.
Here's what you need to know about:
Caesarian sections
If you're not covered by an employer plan and you're trying to buy an individual health insurance policy, you'll typically pay more for maternity benefits, which help cover the costs of carrying and bearing a child.But maternity coverage may be more expensive, or not available at all, if you've had a child by Caesarian section.
C-sections typically cost insurers nearly $3,000 more than vaginal deliveries, and a woman who's had a Caesarian delivery in the past is more likely to have one in the future. Some insurers refuse to provide maternity benefits to such women, while others charge them more for coverage.
How much of an issue this is depends on where you live and on your individual circumstances.
For example, a woman in her early 40s may be deemed at low risk of having another child and offered a policy with a premium that's 25% to 50% higher than what she would have paid without having had a previous C-section, says Amir Mostafaie, a training manager for ConectUS who is a licensed agent in all 3 states.
"If she's in her 20s or 30s, there's generally a higher chance she'll get pregnant again," Mostafaie says. "She may be issued a policy with exclusions" so that maternity coverage isn't included.
Where you live can also have a profound effect on your options.
In "guaranteed issue" states -- New York, New Jersey and Washington -- insurers aren't allowed to cherry-pick their risks or charge more for things like previous C-sections, Mostafaie says. In other states, insurers have few restrictions on what they can do.
"If you're turned down, you might not have other options," Mostafaie says.
If you're in the market for individual health coverage and this issue affects you, consider working with an experienced insurance broker familiar with various insurers' policies. You don't want to risk being turned down for coverage, as that can be a red flag for other insurers, so it's best to find out in advance which companies may penalize you.
Trampolines
Kids love them, but many insurers don't. Some will charge a higher rate to cover the increased liability for injuries, while others won't cover you at all."Even with the proper safety measures in place, trampolines are considered a big risk and account for more injuries requiring emergency-room treatment than backyard swimming pools do," says Loretta Worters, spokeswoman for the Insurance Information Institute, a trade group. "On average, trampoline accidents run about $300 million annually in medical, legal and insurance expenses."
One of my readers bought a trampoline, complete with surround frame and safety netting, as a birthday present for one of her children. She didn't think to mention it to her insurer. When she switched insurance companies a few months later, the new insurer sent out an agent to take pictures of the property.
"Someone from the company saw the trampoline in one of the pictures from the agent," she wrote. To keep the coverage, "we had to take down the trampoline and write that we would not put it up on the property as long as they insured it."
Some insurers will cover a trampoline as long as it's inside a locked fence, to prevent unsupervised children from playing. Others will issue a policy that excludes coverage for injuries from the trampoline.
"Trampolines are what's considered an attractive nuisance, something that invites trespassers," Worters says. "No matter what precautions are taken, there is the possibility that a court case will find the owner of the trampoline guilty of negligence, even if the homeowner posts signs or takes preventative measures."
If you're considering buying a trampoline, ask your insurer about its coverage policies first. But also consider the recommendation of the American Academy of Pediatricians, which has long advised against trampolines.
"Despite all currently available measures to prevent injury, the potential for serious injury while using a trampoline remains," the academy says. "The need for supervision and trained personnel at all times makes home use extremely unwise."
'Bad' dogs
As I wrote in "Your dog's bite could bankrupt you," insurers are increasingly concerned about the rising costs of dog-bite claims. (Dog bites now make up one-third of all homeowner liability claims, and the average cost was $24,511 in 2007, up 28% in five years.) Some insurers have blacklisted certain breeds, such as pit bulls. Others will cover any dog until it bites, and then you could lose your coverage, pay more for it or be forced to sign a waiver that excludes any further damage done by the animal.Insurers don't necessarily make these policies clear upfront. If you're shopping for homeowners coverage, make it clear you own a dog and what breed it is so you don't wind up getting canceled later. Before adding any dog to your household, call your insurer. Consider getting a different breed, or a different insurer, if the two are incompatible.
Bad credit
In most states, insurers that provide homeowners and auto policies are allowed to consider your credit history when deciding whether to issue or renew a policy, as well as how much to charge. (California and Massachusetts, which both ban the use of so-called insurance scoring, are among the exceptions.)Why should credit matter to insurers? Several studies, including an influential one by the Texas Department of Insurance, show a strong link between consumers' credit scores and their propensity to file insurance claims. The worse their scores, in other words, the more likely they are to cost their insurers money.
Unfortunately, credit scores don't differentiate between folks who refuse to pay their bills and those who simply can't because of job loss, medical problems or a subprime mortgage they can't handle.
That's why some consumer advocates have pushed insurance regulators to suspend or restrict insurers' ability to use credit information, especially as the economy deteriorates. So far, the advocates haven't had much success.
If you've had credit problems, you should shop around for insurance, as not all insurers use credit information. You also should do what you can to improve your credit, such as paying bills on time and not using more than 30% of your available credit limits.
Mental-health problems
If you've ever taken antidepressants, seen a therapist or been treated for an addiction, you may pay more for life insurance. If your problems are serious or ongoing, you may have to search hard to find a policy at all.Bipolar disorder, ongoing treatment for substance abuse or a history of suicide attempts can make you tough to insure, says Byron Udell, president and CEO of Accuquote, an online insurance broker.
Other problems may be less of an obstacle, particularly as time passes. If you were treated 10 or 20 years ago for substance abuse and have remained clean, for example, you may not get an insurer's best rates, but you won't be turned down just because of your history.
And some "situational" problems may not cause your rates to rise at all, Udell says. If you were treated for depression after divorce or the death of a spouse, for instance, and are fully recovered, "most companies would view this as a nonissue."
You might be tempted to conceal your troubles and hope your insurer doesn't find out. That's playing with fire. If your insurer discovers your history by, say, talking to your doctors or reviewing your prescription history, it could decide you committed fraud and either cancel your policy (if you're still alive) or refuse to pay out its proceeds (if it conducts the investigation after your death).
"Anything you lie about, if it's material enough to affect their underwriting, that's grounds for fraud," Udell says. "If you lie, you may think you have coverage, but maybe you don't have it. It's better to tell the truth."
Here's another area where having an experienced insurance agent can be an enormous help. The agent should know which insurers are most receptive to applicants with mental-health issues and will be able to advocate for you.
Liz Pulliam Weston's latest book, "Easy Money: How to Simplify Your Finances and Get What You Want Out of Life," is now available. Columns by Weston, the Web's most-read personal-finance writer and winner of the 2007 Clarion Award for online journalism, appear every Monday and Thursday, exclusively on MSN Money.