While you may have researched the weather and housing prices in St. Louis, not many people are aware of the bugs, allergies, and unique health issues in the area.

St. Louis is located near the confluence of the Mississippi and Missouri Rivers. Due to its proximity to rivers and wetlands, mosquitoes are quite prevalent throughout the summer. From late May to early October, using insect repellent during outdoor activities is almost essential.

Cases of West Nile Virus infection are reported annually in Missouri. The Missouri Department of Health and Senior Services releases county-specific mosquito monitoring results every summer and issues official warnings during periods of high infection risk.

Ticks are also a concern throughout St. Louis and Missouri. The state is home to tick-borne diseases such as Lyme Disease, Rocky Mountain Spotted Fever, and Ehrlichiosis. It is crucial to thoroughly check your body after walking on forest trails or grassy areas, as ticks often attach to less visible areas like behind the ears, behind the knees, and in hair.

In terms of allergies, St. Louis is frequently cited as one of the cities in the U.S. with high allergy triggers. St. Louis often ranks high in lists of allergy-prone cities published by medical organizations specializing in allergies.

The main culprits are tree pollen (March to May), grass pollen (May to July), and ragweed pollen (August to October). Particularly during the ragweed season in the fall, many people experience increased sneezing, runny noses, and itchy eyes. Even those who did not have allergy symptoms in Korea may find seasonal allergies manifesting for the first time upon arriving in this area.

Mold is another indoor allergy trigger that cannot be overlooked. St. Louis has high summer humidity, making indoor humidity control important. It is common to use dehumidifiers in homes with basements. When viewing a house, it is advisable to carefully check for signs of mold in the basement or bathroom.

Histoplasmosis is a fungal infection endemic to the Mississippi River region, including Missouri, that requires particular caution. Handling soil contaminated with bird or bat droppings or cleaning old buildings can lead to inhalation of spores. Most cases are mild or asymptomatic, but it can be more severe for those with weakened immune systems. Wearing a mask is recommended near old barns, caves, or abandoned buildings.

Roaches and ants are common pests found in St. Louis homes. The German cockroach, in particular, can spread from one unit to adjacent ones in apartment complexes if an issue arises, so it is wise to check the pest management history of a building before moving in. Carpenter ants may also be found in older wooden homes, and neglecting them can lead to structural damage. Be sure to check the landlord's obligations regarding pest control before signing a lease.

In winter, indoor heating can lead to dry indoor air. Many people use humidifiers, while excessive humidity can lead to mold issues, so maintaining a humidity level of 40-50% is ideal. St. Louis summers are hot and humid, while winters bring a cold that feels even colder. Adjusting your health management routine according to seasonal changes is a way to adapt to life in this area.