Chamomile has real anti-inflammatory and muscle-relaxing properties that can soothe irritated airways, but no large clinical trial has definitively proven it stops coughing. The herb is one of the most widely used traditional remedies for respiratory complaints, and laboratory research on airway cells offers plausible biological reasons why a cup of chamomile tea feels helpful when you are coughing. The honest picture is that the mechanisms are promising, the tradition is centuries old, and the rigorous human evidence specifically for cough remains thin.
What Chamomile Does to Your Airways
A cough is usually your body’s response to irritation or inflammation somewhere along the airway, from the throat down to the bronchial tubes. Chamomile contains compounds that target both of those triggers. Its essential oils and flavonoids act as anti-inflammatory agents, and chamomile has long been used for a wide range of complaints including inflammation, muscle spasms, and gastrointestinal disorders.1PubMed Central. Chamomile: A herbal medicine of the past with bright future The muscle-spasm piece matters here because coughing involves involuntary contractions of the muscles lining your bronchial tubes. If something can relax those muscles, it can reduce the urge and intensity of a cough.
An animal study using rabbits with histamine-induced bronchospasm found that an oral chamomile extract helped relieve the bronchial spasm and the breathing difficulty that came with it.2Tikrit Journal of Pharmaceutical Sciences. The relaxant effect of some drugs and aqueous extract of medicinal plants on bronchial smooth muscle in rabbits That study noted the results clearly suggested the possibility of using chamomile extracts for patients with chronic asthma, though the leap from rabbit airways to human cough relief is one that still needs clinical trials to bridge. The point is that the bronchial-relaxation effect is not just folklore; it has been measured in living tissue.
Protection at the Cellular Level
Beyond relaxing muscles, chamomile appears to protect the cells lining your airways from damage. A 2025 study looked at what happens when human bronchial epithelial cells are exposed to inflammatory stress and then treated with a chamomile extract. The extract reduced cell damage, reversed the process of programmed cell death that inflammation had triggered, and blocked a self-digestion process called autophagy that was spiraling out of control in the stressed cells.3Food Science & Nutrition. Matricaria chamomilla L. Ameliorates Asthma by Protecting OVA-Induced Rats and LPS-Induced Human Bronchial Epithelial Cells Through Suppressing Autophagy and Apoptosis In plain terms, inflamed airway cells were dying and chamomile dialed that back.
This matters for cough because one reason a cough lingers after an infection is that the airway lining stays inflamed and raw. If chamomile genuinely protects those cells, it could shorten the window during which your airways are oversensitive to every wisp of cold air or dust. The caveat is that these were cells in a dish, treated at a specific concentration over 48 hours. Your cup of tea is not a controlled laboratory dose, and nobody has yet confirmed that drinking chamomile achieves the same concentration in airway tissue. Still, the finding gives a plausible biological story for why chamomile has persisted as a respiratory remedy across so many cultures.
Chamomile for Sore Throats and Upper Respiratory Infections
Much of the coughing people do during a cold or flu comes from throat irritation rather than deep lung inflammation. When your throat is raw and swollen, every swallow or breath of dry air triggers a scratchy cough. Here the evidence for chamomile gets a little more concrete. A randomized controlled trial tested a chamomile throat spray against another herbal spray in patients with acute pharyngitis. Both groups saw a significant reduction in the severity of all signs and symptoms. The chamomile group’s symptoms improved over an average of about two and a half days.4Drug Discoveries & Therapeutics. Efficacy of Andrographis paniculata spray in acute pharyngitis: A randomized controlled trial
That trial was not designed to measure cough specifically; it measured sore-throat severity. But given how closely throat irritation and cough are linked during upper respiratory infections, a treatment that reduces throat inflammation is indirectly addressing the cough. Chamomile was the control arm in that study, not the experimental treatment, yet it still produced a statistically significant improvement. The researchers were actually testing a different herb and used chamomile as the benchmark, which says something about how seriously chamomile is taken in this space.
There is also an interesting thread of research on chamomile and viruses. A study examining plant extracts against coronavirus-family viruses found that chamomile extract outperformed black seed and citrus extracts in affecting viral load and the expression of certain immune-signaling proteins.5Reviews in Clinical Medicine. The Effect of Chamomile Extract on Coronavirus This is far from proof that chamomile tea will fight your cold virus, but it adds another layer to the idea that chamomile is doing more than just providing warm liquid.
How People Actually Use It
Most people reaching for chamomile when they have a cough are making tea, and that itself has therapeutic value beyond the chamomile. Warm liquids thin mucus, soothe irritated throat tissue, and promote hydration, all of which help with coughing. The steam rising from a hot cup also loosens congestion in the nasal passages. Chamomile tea adds the herb’s anti-inflammatory compounds on top of these basic warm-liquid benefits, which is partly why it is hard to isolate the chamomile effect from the hot-drink effect in everyday life.
Some people add honey to their chamomile tea, and that combination is worth noting. Honey on its own has decent evidence for cough suppression, particularly in children over one year old. When you stir it into chamomile tea, you get the anti-inflammatory and bronchial-relaxing properties of the herb plus the coating and antimicrobial properties of honey. Neither has blockbuster clinical-trial evidence for cough as a standalone treatment, but combined they address throat irritation, airway inflammation, and mucus management simultaneously. It is one of those cases where the folk remedy is not unreasonable even if the clinical dossier is incomplete.
Steam inhalation with chamomile is another traditional approach. You steep chamomile in a bowl of hot water, lean over it with a towel over your head, and breathe in the vapor. The volatile oils in chamomile become airborne in the steam, delivering them more directly to the upper airways than drinking tea does. There is no clinical trial measuring chamomile steam inhalation against cough specifically, but the practice combines the well-established benefit of warm steam for congestion with the local delivery of chamomile’s active compounds.
Chamomile sprays, as used in the pharyngitis trial mentioned earlier, represent a more targeted delivery method. They apply chamomile extract directly to the back of the throat, bypassing the stomach entirely. If your cough is driven by post-nasal drip or an irritated throat, a spray may reach the problem area more efficiently than tea. These sprays are available commercially in some countries, though availability varies.
When Chamomile Can Make a Cough Worse
For most people, chamomile is gentle and well tolerated. But there is a specific group for whom it can backfire: people with pollen allergies, especially to plants in the daisy family. Chamomile belongs to this family, alongside ragweed, mugwort, and chrysanthemums. If your immune system already reacts to ragweed or mugwort pollen, it can mistake chamomile proteins for the same threat.
A case report described an eight-year-old boy with hay fever and asthma triggered by grass, olive, and mugwort pollen who experienced a severe anaphylactic reaction after drinking chamomile tea for the first time. The study confirmed cross-reactivity between chamomile tea extract and the pollens of giant ragweed and mugwort through antibody testing.6Journal of Allergy and Clinical Immunology. Anaphylactic reaction after the ingestion of chamomile tea: A study of cross-reactivity with other composite pollens That is an extreme case, but it illustrates the mechanism. A follow-up study cautioned that the risk of this type of allergy to chamomile may be underestimated, and that people sensitized to mugwort or birch pollen are at particular risk.7PubMed. Anaphylaxis to camomile: clinical features and allergen cross-reactivity
This creates a cruel irony. If your cough is caused by allergies and you have ragweed or mugwort sensitivity, chamomile could theoretically worsen your symptoms rather than soothe them. Mild reactions might look like throat tingling, lip swelling, or increased nasal congestion, all of which could amplify a cough. Severe reactions, though rare, can include full anaphylaxis. If you have seasonal allergies, especially to fall weeds, try a small amount of chamomile first and watch for any unusual throat or mouth sensations before drinking a full cup.
Chamomile and Blood Thinners
Chamomile contains natural coumarin compounds, which are chemically related to the blood-thinning drug warfarin. This has raised concerns about whether drinking chamomile tea while taking warfarin could increase bleeding risk. A case report described a 70-year-old woman on warfarin who was admitted to the hospital with multiple internal hemorrhages after using chamomile products, including tea and body lotion, to soothe upper respiratory symptoms.8PubMed Central. Warfarin interaction with Matricaria chamomilla The authors emphasized that patients on warfarin need to be aware of this potential interaction.
If you are not taking warfarin or similar anticoagulants, however, the bleeding worry appears to be unfounded. A randomized, placebo-controlled crossover trial in healthy volunteers found that chamomile intake by tea or capsule did not prolong clotting time. The researchers specifically stated that their findings challenge the idea of avoiding chamomile around surgery in patients who are not on warfarin.9PubMed Central. Effect of chamomile intake on blood coagulation tests in healthy volunteers: a randomized, placebo-controlled, crossover trial So the practical takeaway is straightforward: if you are on blood thinners, talk to your doctor before adding chamomile to your cough-relief routine. If you are not, this is unlikely to be a concern.
German Chamomile Versus Roman Chamomile
When you buy chamomile tea at a grocery store, you are almost certainly getting German chamomile (Matricaria chamomilla), which is the species used in the vast majority of clinical research. Roman chamomile (Chamaemelum nobile) is a related but distinct plant with a somewhat different chemical profile. The two share some of the same active compounds but in different proportions. Most of the airway-relevant research, including the bronchial cell protection and animal bronchospasm studies described above, used German chamomile. Roman chamomile is more commonly found in essential oils used for aromatherapy.
If you are buying chamomile specifically to help with a cough, German chamomile is the better-studied option. Check the label: products labeled simply “chamomile” are usually German chamomile, but essential oil blends sometimes use Roman chamomile without making the distinction clear. For tea, this rarely matters because the tea market is dominated by German chamomile. For essential oils or tinctures, it is worth confirming which species you are getting.
How Chamomile Stacks Up Against Other Home Remedies
Chamomile is not the only herbal option people reach for when coughing, and it is worth putting it in context. Honey, as mentioned, has stronger direct evidence for cough suppression, particularly for nighttime cough in children. Thyme has been studied in combination products for bronchitis and has shown some benefit in reducing cough frequency. Ginger and peppermint are commonly used, though their evidence for cough specifically is similarly thin to chamomile’s.
What chamomile has going for it is its mildness and its multi-target approach. It addresses inflammation, muscle spasm, and possibly cellular damage in the airway lining, and it does so with a safety profile that is very forgiving for most people. A cup of chamomile tea before bed is unlikely to interact with anything, unlikely to cause side effects, and combines the proven benefits of warm liquids and hydration with the plausible benefits of the herb itself. For a persistent cough that is keeping you up at night, that combination may outperform its individual parts.
The honest limitation is that cough is a symptom with dozens of causes. Chamomile is most likely to help when the cough is driven by upper airway irritation, post-nasal drip, mild bronchial inflammation, or the lingering rawness after a cold. It is not going to address a cough caused by acid reflux, medication side effects, or a serious lower respiratory infection. If your cough has lasted more than three weeks, is producing blood-tinged mucus, or is accompanied by fever and shortness of breath, the right answer is a doctor’s visit, not another cup of tea.
Children, Pregnancy, and Other Special Cases
Parents often wonder whether chamomile tea is safe for a coughing child. In many cultures, diluted chamomile tea is given to children as young as six months for colic and teething, and extending that to cough relief is common practice. The allergy risk discussed earlier applies to children as well, and the case of anaphylaxis in the eight-year-old boy is a reminder that atopic children with known pollen sensitivities deserve extra caution.6Journal of Allergy and Clinical Immunology. Anaphylactic reaction after the ingestion of chamomile tea: A study of cross-reactivity with other composite pollens For children without pollen allergies, weak chamomile tea in small amounts is generally considered safe, but concentrated extracts and essential oils should be avoided in young children.
During pregnancy, chamomile tea in moderate amounts is widely consumed and generally considered low-risk, though some practitioners advise caution because chamomile has historically been associated with uterine-stimulating effects at high doses. A cup or two of tea per day is very different from a concentrated supplement, and most medical guidance draws the line at high-dose chamomile capsules or tinctures rather than the occasional cup of tea. If you are pregnant and reaching for chamomile to soothe a cough, standard-strength tea is the safest form.
People taking sedatives, benzodiazepines, or other central-nervous-system depressants should also be aware that chamomile has mild sedative properties. This is usually a feature rather than a bug when you are coughing at 2 a.m. and just want to sleep, but combining it with prescription sedatives could amplify drowsiness. The effect from a single cup of tea is mild, but concentrated chamomile supplements taken alongside sleep medications deserve a conversation with a pharmacist.
Brewing for Maximum Benefit
If you are going to use chamomile tea for a cough, preparation matters more than most people think. The anti-inflammatory compounds in chamomile are extracted more efficiently with hotter water and longer steeping times. A quick dunk of a tea bag for two minutes gives you a pleasant-tasting drink but leaves much of the active content in the bag. Steeping for five to ten minutes with a lid on the cup, which prevents the volatile oils from escaping with the steam, produces a noticeably stronger and more bitter brew. That bitterness is the flavonoids and terpenoids that do the actual work.
Loose-flower chamomile generally yields a stronger infusion than pre-bagged tea because the flowers are less processed and the bag does not restrict water flow around the plant material. About one tablespoon of dried flowers per cup is a common recommendation. If the taste at full strength is too bitter, honey serves double duty as a sweetener and a cough soother in its own right. Drinking the tea while it is still quite warm maximizes the steam-inhalation effect and the soothing action on the throat. Letting it cool to lukewarm before drinking sacrifices some of that benefit, though the anti-inflammatory compounds remain active regardless of temperature.