Hoosier State Today

• An overwhelming majority of Americans celebrate Halloween.

• Sinus infections caused by viruses are contagious.

• Common colds are more likely in the fall and winter, and they can lead to sinus infections.

As Americans gather for festive activities during the fall and winter, it is important to be aware of common colds and contagious infections. A survey conducted by the National Confectioners Association in September found that 93% of Americans were planning to celebrate Halloween in some way, according to Cision PR Newswire.

Mingling over the holidays could lead to a higher chance of getting a sinus infection, as sinus infections caused by viruses can be contagious, according to WebMD. The sinus infection itself is not contagious. However, there are viruses that cause sinus infections. People who catch the virus may or may not develop a sinus infection.

"Sinusitis occurs when the linings of your nose, sinuses and throat become inflamed, possibly from a preexisting cold or allergies," Dr. Nicholas Hollenkamp of Indianapolis Sinus Center told Hoosier State Today. "Chronic sinusitis is when this inflammation lasts three months or more. We offer on-site diagnostic testing, including low-dose CT scans, to get a better look inside your sinus cavity and identify inflammation and signs of infection."

These viruses can be spread by someone sneezing or coughing. Other causes of sinus infections, such as allergies or bacteria, are not contagious. People who have sinus infections should cover their noses and mouths when sneezing or coughing and should wash their hands often. To avoid getting sick, make sure to wash hands often and avoid touching the eyes, nose and mouth.

While many people know that allergy symptoms and common colds are more frequent in the fall and winter, they may not realize that allergies and colds can devolve into sinus infections. Allergies, colds and sinus infections have many of the same symptoms, so it can be difficult to distinguish between them.

Consulting with an expert is advisable when experiencing symptoms. Dr. Tran Locke -- an ear, nose, and throat (ENT) specialist who works at Baylor College of Medicine -- provides insight into what to do for symptoms. If symptoms such as congestion last longer than 10 days, it might be time to see a doctor to determine whether a sinus infection has developed, Locke told the Houston Chronicle.

Other symptoms could include a feeling of pressure in the face, a decreased sense of smell, tooth pain or a fever. Many patients can resolve their symptoms through medication, but for some, a minimally invasive surgery might be the best option in order to treat an underlying condition, Locke said.

People who have experienced any of those symptoms, or other symptoms such as fatigue, can take this Self-Assessment Quiz to determine whether seeking treatment could be beneficial.