Mold Allergy in Florida: Symptoms, Hidden Sources and How to Get Relief

Written by Cherlie Joseph, MSN, FNP-BC · Medically reviewed by Naurah Gaspard, DNP, FNP-C, FNP-BC · Updated November 2026

Mold allergy causes the same sneezing, stuffy nose, itchy eyes and cough as pollen allergy, but in Florida it can last all year because humidity lets mold grow indoors and out. The most important fix is moisture control: keep indoor humidity below 50 percent and dry leaks within 24 to 48 hours. Steroid nasal sprays and antihistamines treat the symptoms.

Why mold allergy is so common in Florida

Mold grows wherever there is moisture and something to feed on, like drywall, wood, fabric or dust. Florida's heat, humidity, summer storms and hurricanes create ideal conditions. Outdoor mold spores often rise after rain, in shady damp areas and around decaying leaves. Indoors, mold follows water: leaks, condensation, flooding and air conditioners that are not removing enough moisture.

Unlike pollen, mold does not have a short season here, which is why some Floridians feel congested month after month.

Mold allergy symptoms

The CDC lists stuffy nose, wheezing and red or itchy eyes or skin as common reactions in people sensitive to mold. You may also notice:

• Sneezing and runny nose, often worse in a certain room or building
• Postnasal drip and cough
• Symptoms that improve when you travel or spend time somewhere drier
• Asthma flares in people who have asthma

People with a weakened immune system or chronic lung disease can develop more serious mold-related lung problems and should get prompt medical advice if they are exposed to a lot of mold.

Where mold hides at home

Spot	Why mold grows	What helps
Bathrooms (grout, caulk, ceiling)	Steam from showers	Run the exhaust fan during and after showers; wipe down wet surfaces.
Under sinks and around toilets	Slow, hidden leaks	Check for drips and soft cabinet floors; fix leaks fast.
AC unit, vents and drain line	Condensation	Keep up with service, change filters and keep the drain line clear.
Windows and sliding doors	Condensation and rain	Wipe moisture and check seals.
Closets and laundry areas	Poor airflow, damp clothes	Dry laundry fully; do not leave wet clothes in the washer.
Carpet and walls after a storm	Water intrusion	Dry within 24 to 48 hours; remove soaked materials that can't be dried.

How to keep humidity and mold down

The EPA recommends keeping indoor humidity below 60 percent, ideally between 30 and 50 percent. A simple hygrometer from a hardware store shows your level.

• Run your air conditioning consistently in warm months rather than shutting it off during the day. Ask an HVAC technician if your system is sized correctly to remove moisture.
• Use a dehumidifier in damp rooms and empty or drain it regularly.
• Fix leaks and dry water-damaged areas within 24 to 48 hours.
• For small areas of mold on hard surfaces, scrub with detergent and water and dry completely. Wear gloves, goggles and an N95 mask. The EPA suggests professional help for areas larger than about 10 square feet or after flooding.
• Do not just paint or caulk over mold.
• Keep houseplants to a minimum if you are very sensitive, and keep gutters clear.

Treatments that help

Medicine for mold allergy is the same as for other nasal allergies. A daily steroid nasal spray such as fluticasone (Flonase) or triamcinolone (Nasacort) is the most effective option for congestion. Non-drowsy antihistamines such as loratadine, fexofenadine or cetirizine help with sneezing and itching. Saline rinses with distilled or boiled water can clear spores from the nose.

If you have asthma, make sure your inhalers are up to date and that you have a plan for flares. An allergist can test for mold sensitivity and discuss immunotherapy if medicine is not enough. New or worsening symptoms are best reviewed at a visit.

Frequently asked questions

What are the first signs of mold allergy?

Common early signs are sneezing, a stuffy or runny nose, itchy or watery eyes and a cough, often worse in one room or building and better when you leave it.

Can a dehumidifier help mold allergies?

Yes. Keeping indoor humidity between about 30 and 50 percent, as the EPA recommends, makes it much harder for mold to grow. In Florida, a dehumidifier plus steady air conditioning is often needed in damp rooms.

Should I test my house for mold?

Usually not. The CDC and EPA note that if you can see or smell mold, the priority is to fix the moisture problem and clean it up, rather than test to identify the type.

Sources

• EPA: A Brief Guide to Mold, Moisture and Your Home
• CDC: Mold and your health
• AAAAI: Hay Fever Medications

Keep reading

• Seasonal allergies in Florida
• Steroid nasal sprays for allergies
• Asthma inhaler refill
• Chronic sinusitis
• Browse all conditions and treatments A to Z

This article is for general education and is not a substitute for medical advice. Treatment, including any prescription, is decided by a licensed provider after reviewing your health history. OurTopClinic is not for emergencies; if you have a medical emergency, call 911. OurTopClinic serves adults located in Florida, New Mexico, Oregon and Washington. Learn more at ourtopclinic.com.