Mold can be one of the nastiest problems you will encounter. It can bring severe health issues, not just right away but many can haunt you for years to come.
Children exposed to mold have been know to be more prone to asthma in the later years of life if they were exposed to too much mold growing up. It is important to insure you have no such issues in your home.
Another characteristic of mold is that it can be completely invisible. You might not even know it is there though it often puts off a musty smell. If you have any reason whatsoever to believe you have a mold issue, you should contact a remediation specialist to measure the levels and analyze your problem. Better safe than sorry.
While mold, to some degree, is always in the air in your home the art is to keep it managed and under control. If levels are low enough, you will have no health issues. But if you have recently had flooding issues, moisture under the house, leaks of any kind, or any issue involving standing water you are susceptible to mold problems.