How a Humidifier Helps Relieve Cough Symptoms

Did you know that a humidity level below 40% makes you susceptible to irritated airways and infections? Whether it’s the dry winter air or an air conditioner in your office, low humidity has a slightly negative effect on overall health and productivity.¹  

How Does a Humidifier Help a Cough?

When you cough, your body might be trying to flush out irritants, dirt, and germs from your airways. ² When the air around you is dry, it can dry out your naturally moist nasal passages, resulting in lower clearance of dust particles and germs. These particles and germs trigger cough receptors leading to cough.  Using a humidifier when you cough may improve the air and your cough.  

Benefits of Moist Air on Respiratory Health

Moist air has been proven to be beneficial to respiratory health, but within a specific range. Excess moisture can increase risks, just as low moisture leads to increased risks. The optimal humidity range is between 40%-60%.³ Specific benefits include:⁴ 

• Supporting airway hydration
• Reduce inflammation
• Promoting mucociliary clearance 
• Lowering infection risks

Humidifiers and Dry Cough

Would a humidifier help a cough? Yes! Depending on the cause of the dry cough, humidification can temporarily lower the urge to cough.  

Optimum humidity can lower inflammation of the airways (throat), thus reducing the urge to cough.¹ 

If you’re wondering if a humidifier is good for cough – it is. However using a Humidifier is not a cure, but is one of the effective winter cough remedies you can use.  

Humidified air can help loosen mucus and helps clear chest congestion, especially in cases where mucus has thickened because of dry air.³  

Choosing the Right Humidifier for Your Cough

There are two main categories of humidifiers for your home. A cool mist and a warm mist humidifier.⁴ The choice of humidifier depends on what symptoms and conditions you’re trying to overcome. Each has their own unique benefits and are effective in their own ways.

Types of Humidifiers: Pros and Cons 

There are many types of humidifiers available for home use. You can choose one based on how they work.  

• Ultrasonic humidifier: As the name suggests, uses ultrasonic vibration to create a fine mist. It may or may not have the warm-mist feature.

Pros: It is quiet and suitable for home use 

Cons: May release mineral dust if distilled water is not used 

• Evaporative humidifier: A fan blows air through a wet filter to add moisture to the air. 

Pros: Regulates itself and is more affordable compared to an ultrasonic humidifier. 

Cons: May make some noise while running. The filter must be closely monitored and changed regularly to prevent contamination. 

• Steam vaporizer: Water is heated to form vapor that can be inhaled or used to humidify the room.

Pros: Always produces a warm mist, which is beneficial 

Cons: Poses a burn risk. Unsuitable for use with small children because of the heat. 

• Impeller humidifier: A disk rotates to cause the water to form droplets and hence a cool mist.

Pros: No risk of burns.  

Cons: It has a filter that needs to be regularly checked and changed to prevent infections 

• Central humidifier: this is built into a home’s air conditioning or HVAC system. 

Pros: It automatically maintains optimum humidity. It can be set to a cool mist or warm mist, depending on preference. 

Cons: Not portable and all rooms will be subject to setting.

Tips for Using a Humidifier Effectively

Humidifiers help with cough, but you must know how to maintain them effectively, so you don’t worsen a loved one’s cough or cold.  

There are two main criteria for using humidifiers effectively: 

1. Prevent contamination⁵
1. Requires regular cleaning and changing the filters (if it has any)
2. Use only distilled water to prevent contamination or infections
3. Do not leave water in the humidifier after use. Empty it out and store it dry, till it’s needed again.
   
2. Keep the humidity at an optimal level of 40%-60%¹
1. Constant monitoring may be needed especially if your humidifier does not come with an inbuilt hygrometer (an instrument that detects the level of relative humidity in the room)
2. Keep the room well ventilated

Keeping Your Humidifier Clean

To clean your humidifier you must follow the manual for your specific type of humidifier. In general, the water tanks and filters are to be regularly cleaned. 

Some recommend cleaning daily when in use, while some recommend cleaning once a week. If you use your humidifier constantly, then it’s a good idea to disassemble the parts with the manual as a guide and clean each part. 

You may also want to disinfect using a prescribed cleaning liquid. Wash away disinfectants or soaps to ensure traces of these are not sprayed into the air when in operation.

Common Mistakes to Avoid

It’s important to keep track of your humidifier’s operations, because it’s easy to forget or skip important steps especially when you’re a little under the weather. Key mistakes to avoid are: 

• Using tap water instead of distilled water in ultrasonic humidifiers – could release minerals into the air. When inhaled could be deposited in the lungs.
• Not cleaning because you use distilled water -  just because you use distilled water, it does not mean that the water, the tank and filter won’t become dirty or contaminated. They do, so you must regularly clean your humidifier regardless.
• Placing disinfectants in the tank to clean the tank – this is to be avoided at all costs, because running a humidifier with disinfectant and water in the tank can lead to fatal lung injury or other serious lung problems.⁶

Using a home humidifier for cough is a good but temporary remedy. Make sure you follow all the manufacturer’s instructions and stay healthy. Pair the humidifier with other home remedies for quick relief. And be sure to consult your doctor if your cough or cold persists.   

References

1. Wolkoff P. Indoor air humidity revisited: Impact on acute symptoms, work productivity, and risk of influenza and COVID-19 infection. Int J Hyg Environ Health. 2024;256:114313. doi:10.1016/j.ijheh.2023.114313
2. Cleveland Clinic. (2025, August 18). Cough: Causes, types, diagnosis & treatment. https://my.clevelandclinic.org/health/symptoms/17755-cough 
3. Wolkoff, P. Indoor air humidity, air quality, and health - An overview.. International journal of hygiene and environmental health. 2018; 221 3. https://doi.org/10.1016/j.ijheh.2018.01.015.
4. Guarnieri G, Olivieri B, Senna G, Vianello A. Relative Humidity and Its Impact on the Immune System and Infections. Int J Mol Sci. 2023 May 29;24(11):9456. doi: 10.3390/ijms24119456. PMID: 37298409; PMCID: PMC10253274. https://pmc.ncbi.nlm.nih.gov/articles/PMC10253274/ 
5. Chen, X. Research progress on the impact of humidification therapy on mucociliary clearance in tracheostomy patients. Discover Medicine. 2025; 2. https://doi.org/10.1007/s44337-025-00508-1.
6. Kic, P. Assessment of indoor air humidifier performance. Engineering for Rural Development. 2025 https://doi.org/10.22616/erdev.2025.24.tf006.
7. Tyndall, R., Lehman, E., Bowman, E., Milton, D., & Barbaree, J. Home Humidifiers as a Potential Source of Exposure to Microbial Pathogens, Endotoxins, and Allergens. Indoor Air. 1995; 5. https://doi.org/10.1111/j.1600-0668.1995.t01-1-00003.x.
8. Lee, J., Kim, Y., & Kwon, J. Fatal misuse of humidifier disinfectants in Korea: importance of screening risk assessment and implications for management of chemicals in consumer products.. Environmental science & technology. 2012; 46 5. https://doi.org/10.1021/es300567j.