The Colorado Department of Public Health and Environment says more than 500 people have been hospitalized this season for the flu, and that number is going up. According to the Center for Disease Control, most of the nation is seeing a widespread outbreak of the flu.

Doctors at Swedish Medical Center say they are seeing an increase in children coming in with flu-like symptoms. Doctors say it's important to bring children into see their doctor right away if they're showing signs of the flu because it's possible it can get into their lungs and cause bigger health problems.

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"There is potential of contracting pneumonia with the flu. This year we're seeing a lot of patients, mostly those who haven't been vaccinated. Even those who have been vaccinated are getting sick, they're just getting a less server case," Dr. Mary Saunders said.

The Colorado Department of Public Health and Environment says flu season started a month early this year and describes the number of people hospitalized for the virus as the "tip of the iceberg."

"We see hospitalizations every year in Colorado on average 750 people are hospitalized every year from flu. We also know many people die every year in Colorado from influenza. I think clearly it's not going to be an average year," Dr. Lisa Miller with the Colorado Department of Public Health said.

There is still time for people to get vaccinated. The CDC recommends that everyone 6 months and older get vaccinated.