Warm water has been known to provide comfort when experiencing throat discomfort. Therefore, some people believe warm water can help relieve a cough.
However, this belief that warm water can relieve cough still requires scientific explanation and a deeper understanding of how its effects work in the body.
The following are several benefits of warm water for relieving a cough, compiled from various sources, and they may serve as a health reference.
Benefits of Warm Water for a Cough
Warm water can help relieve a cough through several physical and physiological mechanisms that work together.
A study published in the Rhinology journal stated that when warm water enters the body, temperature changes can influence fluid movement and general tissue response.
Additionally, a warm sensation from consuming warm water can trigger a sensory response, which helps the body feel more relaxed.
The combination of temperature, hydration, and natural physiological responses can affect overall comfort, although it is not a direct treatment. Several benefits of warm water for relieving a cough include the following:
1. Thinning Phlegm
Research in the Madising na Maupe Journal suggests that drinking warm water can help thin phlegm, making it easier to expel.
The increased temperature affects the physical characteristics of mucus, allowing it to become more fluid and easier to expel. This mechanism is important in productive coughs, where the phlegm tends to be thick and difficult to clear.
A study published in the Critical Care journal also indicated that when the respiratory tract is irritated due to flu, colds, or allergic reactions, the body tends to produce larger amounts of mucus.
This mucus can become thicker and difficult to expel, triggering prolonged coughing.
By drinking water, the consistency of mucus may become thinner and easier to clear. These changes help the cough reflex work more effectively in clearing phlegm from the airways.
When phlegm is expelled more effectively, a productive cough can be more effective, the respiratory tract feels more comfortable, and the level of irritation is reduced.
2. Soothing the Throat
An article published in the Journal of Global Health stated that warm water can directly moisten the surface of the mucosa in the throat. A properly hydrated mucosa becomes moister and less prone to dryness, reducing the risk of itching and discomfort.
In addition, the temperature of warm water can trigger dilation of blood vessels in the throat. An increased blood flow delivers more fluid and nutrients to the mucosal tissue, maintaining its natural moisture.
Meanwhile, a study in the Jurnal Keperawatan dan Kebidanan suggested that consuming warm water for a productive cough not only helps soothe the throat in people experiencing a cough but also provides similar effects in patients with acute respiratory infections (ARI).
Therefore, hydration of the mucosal lining from warm water has been shown to provide comfort that helps support throat function, not only in cases of coughing.
3. Reducing Irritation
An article published in the Rhinology journal also mentioned that nerve receptors in the throat respond to warm stimulation. Warm temperatures create a calming effect that can reduce coughing caused by a dry or irritated throat.
Warm water works by soothing the airways and throat, making the mucosal lining softer and less prone to irritation.
Warm water also helps loosen phlegm or mucus, making it easier to expel. This warm sensation can help soothe a sore or itchy throat, while mucosal hydration and thinner mucus support the clearance of secretions.
As a result, warm water may help relieve cough symptoms and reduce throat irritation.
Best Time to Drink Warm Water when Having a Cough
After answering the question, “Can warm water help relieve a cough?”, let’s find out the most effective time to consume it. Here are some recommended times to drink warm water when having a cough.
1. Before Bedtime
Drinking warm water about 1–2 hours before bedtime can help soothe the throat, reduce dryness and irritation, and loosen mucus, helping keep coughing under control during the night.
With a moisturized throat, the risk of dry cough or irritation-related coughing can be reduced. Consume warm drinks, such as warm water or tea, as they may help provide relief for a dry or sore throat.
A habit of drinking warm water before bedtime may also help the body feel more relaxed, allowing for more comfortable sleep while recovering from a cough or flu.
2. After Waking Up
After waking up, the respiratory tract and throat often become drier due to reduced hydration at night.
By starting the day with a glass of warm water, you may help hydrate the mucosal lining, maintain throat moisture, and keep the airways more comfortable despite exposure to dry air or mucus buildup.
Drinking water in the morning is not only beneficial for respiratory health but also supports digestive function, helping the body feel more prepared for daily activities.
3. As Soon as You Start Coughing
If a cough occurs or worsens after prolonged talking, singing, or exposure to cold and dry air, it is recommended to drink warm water. This can help to relieve throat irritation.
An article published in the Journal of Thoracic Disease suggested that consuming warm water regularly, for example every 2–3 hours, may help support mucosal hydration and promote the natural clearance of mucus.
However, if a heavy cough occurs, produces foul-smelling phlegm, is accompanied by a high fever, shortness of breath, or even coughing up blood, you should consult a medical professional immediately.
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