What Are the Symptoms of Mold Exposure?

The most common symptoms of mold exposure are a stuffy or runny nose, sore throat, coughing or wheezing, burning or itchy eyes, and skin rash. People with asthma or a mold allergy can have more severe reactions, and those with weakened immune systems or chronic lung disease may develop lung infections. Symptoms can appear immediately after exposure or be delayed, and they often improve once you leave the moldy environment and the moisture source is fixed.

This guide explains the symptoms in plain language, who faces the highest risk, how to tell mold from a common cold, and what Texas homeowners should do next.

What are the most common symptoms of mold exposure?

According to the CDC, mold can cause the following reactions in sensitive people:

• Nasal and sinus symptoms — stuffy nose, runny nose, sneezing, and post-nasal drip
• Respiratory symptoms — coughing, wheezing, chest tightness, and shortness of breath
• Eye irritation — red, itchy, watery, or burning eyes
• Throat irritation — sore or scratchy throat
• Skin reactions — rash, itchiness, or eczema flare-ups

The U.S. EPA explains why: molds produce allergens, irritants, and sometimes toxic substances. That means reactions can be allergic (hay-fever-type sneezing and congestion) or simply irritant-based, affecting the eyes, skin, nose, throat, and lungs of both allergic and non-allergic people. Reactions may be immediate or show up hours later.

It's worth noting the EPA's own caveat for accuracy: symptoms beyond these allergic and irritant types are not commonly reported from inhaling mold, and research into mold's health effects is still ongoing. Be cautious about attributing a wide range of unrelated symptoms to mold without a medical evaluation.

Who is most at risk from mold exposure?

Most healthy adults experience only mild, temporary symptoms. However, some groups are far more sensitive and can develop serious reactions:

• People with asthma — mold can trigger attacks and worsen existing asthma
• People with mold allergies — once sensitized, they may react to even trace amounts of mold
• Immune-compromised individuals — including those undergoing chemotherapy or organ-transplant patients, who face a risk of lung infection
• People with chronic lung disease — who may develop infections in the lungs
• Infants, young children, and older adults — who tend to be more vulnerable

The CDC also notes that heavy exposure — such as in occupational settings like moldy hay or agricultural work — can cause severe reactions including fever and shortness of breath.

What conditions are linked to living in a damp, moldy building?

The CDC and NIOSH report that people living or working in damp buildings more often experience respiratory symptoms, respiratory infections, and the development or worsening of asthma. A landmark Institute of Medicine review (cited by the CDC) found sufficient evidence linking indoor mold exposure to:

• Upper-respiratory symptoms, cough, and wheeze in otherwise healthy people
• Asthma symptoms in people who already have asthma
• Hypersensitivity pneumonitis — a lung inflammation — in susceptible individuals

Other conditions associated with damp indoor environments include allergic rhinitis (hay fever) and eczema.

How can I tell mold symptoms from a cold or allergies?

Mold symptoms overlap heavily with colds and seasonal allergies, so context matters more than the symptoms themselves. Consider these clues:

• Location pattern — Symptoms improve when you leave the house or a specific room and return when you come back. That's a strong signal of an indoor trigger.
• Duration — Colds usually clear in 7–10 days. Symptoms that linger for weeks may point to an ongoing allergen or irritant.
• No fever — Mold-related irritation typically doesn't cause the fever or body aches common with viral infections (except in rare heavy-exposure cases).
• Visible or smelly clues — Musty odors, water stains, or visible growth near where symptoms worsen strengthen the case for mold.

Only a physician can diagnose the cause of your symptoms. If symptoms are persistent or severe, see a doctor or allergist for testing.

Should I test my home for mold in Texas?

The CDC does not generally recommend testing or sampling for mold. The reasons: health effects vary widely from person to person, there are no established standards for what counts as an "acceptable" amount of indoor mold, and sampling is expensive. Regardless of the type of mold, the recommended response is the same — remove the mold and fix the moisture source that's feeding it.

The single most important step is moisture control. The EPA's widely cited "24–48 hour rule" advises drying any water-damaged areas and materials within 24 to 48 hours to prevent mold from taking hold. In humid Texas climates, promptly addressing roof leaks, plumbing drips, HVAC condensation, and post-storm flooding is critical.

When should I hire a licensed mold professional in Texas?

Texas has some of the most specific mold rules in the country. Under Texas Occupations Code Chapter 1958 and the Texas Mold Assessment and Remediation Rules, mold remediation projects that exceed 25 contiguous square feet generally must be performed by professionals licensed through the Texas Department of Licensing and Regulation (TDLR). Exemptions for small or owner-occupied jobs typically disappear for rental properties, commercial buildings, or any project over 25 square feet that uses outside labor.

Two Texas rules are especially important for consumers:

• Separation of duties — The same person or company cannot perform both the mold assessment and the remediation on the same project, and cannot own an interest in both firms. This protects you from conflicts of interest.
• Remediation protocol — A licensed mold assessment consultant must prepare a project-specific protocol and give it to you at least one calendar day before remediation begins, specifying the areas, methods, containment, and clearance criteria.

You can verify any contractor's license through TDLR's public license lookup, or use our directory to find pre-vetted professionals. Find a licensed mold contractor near you, or browse the full Texas directory.

What does mold remediation cost and does insurance cover it in Texas?

Costs vary widely depending on the size of the affected area, the location, and whether structural materials must be removed. Because Texas cost figures vary by region and project, get multiple written estimates from licensed providers rather than relying on a single average.

On insurance: most Texas homeowner policies are HO-A forms that typically cover only sudden and accidental water damage, not gradual or repeated leakage. Many policies exclude mold remediation, and those that include it often cap the coverage. Some policies offer only small sub-limits unless you purchase mold "buy-back" coverage. The Texas Department of Insurance can help homeowners who have trouble finding coverage. Note also that you are not required to report mold to your insurer if you pay for remediation yourself — and filing claims can affect your future insurability, since property claims are logged in the national CLUE database.

What should I do right now if I suspect mold exposure?

1. Protect your health — If symptoms are severe or persistent, see a doctor, especially if you or a family member has asthma, allergies, or a weakened immune system.
2. Find and fix the moisture — Stop leaks and dry wet materials within 24–48 hours.
3. Don't disturb large areas — Cutting into moldy drywall without containment can spread spores. Anything over 25 square feet should go to a licensed professional.
4. Get a licensed assessment — In Texas, an assessment consultant (separate from your remediator) can define the scope of the problem.

Ready to take action? Use our search tool to find a TDLR-licensed contractor in your area.