Ragweed and Mugwort Allergy: The August Pollen Peak

While most people embrace summer and enjoy their holidays, millions of allergy sufferers experience their most difficult period of the year. August brings the peak pollination of two of the most problematic weeds — common mugwort (Artemisia vulgaris) and common ragweed (Ambrosia artemisiifolia). Intense sneezing, watery eyes, and a blocked nose become daily reality for hundreds of thousands of people throughout late summer.

It is estimated that between 20 and 30% of the general population suffers from pollen allergies, and weed pollen — unlike tree or grass pollen — is the main culprit in the second half of summer. For many allergy sufferers this means August becomes the month when, without effective treatment, everyday life, work, and physical activity are genuinely difficult.

The good news is that highly effective over-the-counter (OTC) medications exist today, allowing most people to manage their symptoms and get on with normal life. The not-so-good news: many people reach for the wrong products, start them too late, or use them incorrectly. In this article we explain the differences between mugwort and ragweed, how the available medications work, and when your allergy warrants a specialist consultation.

When do mugwort and ragweed pollinate?

Both plants belong to the daisy family (Asteraceae) and pollinate mainly in the second half of summer, though each follows a slightly different calendar:

• Common mugwort — pollination usually begins in July, peaks in August, and continues into September. It is one of the most common airborne allergens and is estimated to sensitise 15–20% of people with respiratory allergies.
• Common ragweed — its range has been expanding steadily across Europe, particularly in southern and eastern regions. Pollination starts somewhat later — from mid-August — and can continue right through to the first frosts in October. A single plant can produce up to one billion pollen grains per season, and the concentration needed to trigger symptoms is exceptionally low (as few as 10 grains per m³ of air).

High temperatures, wind, and dry weather intensify pollen release. The highest-risk hours are early morning and early afternoon — this is when pollen concentrations in the air are at their highest.

Symptoms — how to tell allergy from a cold?

Symptoms of a respiratory allergy to mugwort and ragweed can easily be mistaken for an upper respiratory infection. The key differences are:

• Sneezing — rapid-fire, in bursts, often ten or more times in a row
• Runny nose — copious and clear (with an infection the discharge turns yellow-green)
• Itching — of the nose, throat, palate, ears, and eyes
• Watery, red eyes — allergic conjunctivitis accompanies allergic rhinitis in over 80% of sufferers
• Nasal congestion — can lead to poor sleep, mouth-breathing, and headaches
• No fever — allergies do not generally cause a raised temperature; if a fever develops, this points to a secondary bacterial infection or a viral illness

In people with co-existing asthma, symptoms can include wheezing, cough, and shortness of breath — these signs warrant careful attention and medical consultation.

Over-the-counter medications — what to choose?

Second-generation antihistamines (oral tablets)

These are the cornerstone of treating allergic rhinitis. Second-generation antihistamines — unlike older first-generation drugs (e.g. clemastine, promethazine) — cause little or no drowsiness, act longer, and only require one dose per day. Active ingredients widely available over-the-counter include:

• Cetirizine — very popular, effective, and affordable; a small number of people experience mild drowsiness
• Loratadine — a classic choice, virtually non-sedating
• Fexofenadine — the least sedating of the three; a good option for drivers and machine operators
• Bilastine — fast onset of action; no food interaction issues like fexofenadine
• Rupatadine — also acts against pro-inflammatory mediators (PAF); available without prescription in certain formulations

Antihistamines work best when taken regularly throughout the entire pollen season, not just "when symptoms flare up." They work preventively — blocking histamine receptors before the allergen can trigger a reaction.

Intranasal Corticosteroids — Over-the-Counter

These are considered the most effective treatment for allergic rhinitis. They act locally (with minimal systemic absorption), reducing mucosal swelling, secretion, and congestion. The full effect builds over several days of regular use — so it is worth starting 1–2 weeks before the expected pollen peak.

Active ingredients available without prescription include:

• Mometasone — for ages 12 and over; once daily; very low rate of systemic absorption
• Fluticasone furoate — available in over-the-counter formulations; for ages 12 and over
• Beclomethasone — slightly older generation, effective; age thresholds vary by product, check the label
• Budesonide — widely used; available in various formulations

Correct technique matters: tilt your head slightly forward (not back), and aim the spray towards the outer wall of the nostril (not the nasal septum). Consistent technique helps prevent nosebleeds.

Eye Drops and Gels (Over-the-Counter Ocular Medications)

Several product groups help with allergic conjunctivitis:

• Sodium cromoglicate — a mast-cell stabiliser; prevents histamine release; requires dosing 4 times daily; works preventively
• Ketotifen eye drops — combines antihistamine action with mast-cell stabilisation; twice daily
• Olopatadine — rapidly relieves itching and burning in the eyes
• Artificial tears — preservative-free lubricating drops; mechanically rinse pollen from the conjunctiva; safe for frequent use

Nasal decongestants

Oxymetazoline and xylometazoline provide rapid relief from a blocked nose, but must not be used for more than 3–5 days due to the risk of rebound congestion (rhinitis medicamentosa) — the nasal mucosa effectively becomes dependent on the drug. They can be useful in the short term (e.g. before an important meeting) but should never replace first-line treatment.

Cross-reactivity and Oral Allergy Syndrome (OAS)

This is one of the lesser-known but very important aspects of mugwort and ragweed allergy. The pollen from these plants contains proteins structurally similar to those found in certain foods — the immune system "mistakenly" reacts to those foods as if they were pollen. This is known as cross-reactivity and affects a significant proportion of weed-pollen sufferers.

Importantly, symptoms of cross-reactivity can appear or worsen precisely in August and September — because at that time both airborne pollen concentrations and exposure to fresh seasonal vegetables and fruits are at their highest. Understanding this connection can be the key to explaining why some days feel unbearable even when medication is being taken consistently.

Most common mugwort cross-reactions

• Celery (stalk and root) — the strongest cross-reactive allergen for mugwort; can trigger serious systemic reactions
• Carrot, parsley, dill, anise
• Mango, melon, kiwi, peach, sweet cherry
• Bell pepper, tomatoes (in some people)
• Spices: caraway, coriander, curry, mustard

Most common ragweed cross-reactions

• Cantaloupe melon and watermelon — a classic pairing with ragweed allergy
• Banana, cucumber, courgette (zucchini)
• Chamomile (chamomile tea can worsen symptoms!)

How does OAS present itself?

Oral Allergy Syndrome causes itching and tingling of the lips, tongue, palate, and throat — appearing within minutes of eating a raw cross-reactive food. Symptoms typically resolve on their own. Cooking or heat treatment often destroys the allergens — cooked carrots are well tolerated by many people who react to raw ones.

Important: in some individuals (particularly those with a celery allergy or peanut allergy) reactions can be severe and may require emergency treatment — discuss this with an allergist.

How to reduce pollen exposure?

Medications help control symptoms, but reducing your allergen exposure can lower the doses you need and significantly improve quality of life. Even the best pharmacotherapy will be less effective if you are exposed to high allergen concentrations every day. Practical steps that make a real difference:

• Check pollen forecasts (apps or local air quality services) — on high-pollen days, limit time spent outdoors
• Avoid opening windows in the morning (6:00–10:00) and on windy, sunny days — pollen concentrations are at their peak then; ventilate your home after rain or in the evening
• Change clothes and wash your face and hair when you come home — pollen settles on hair and clothing and can continue irritating you for hours after you get back indoors
• Use HEPA filters in your car and in living areas — air purifiers with a HEPA H13 filter capture pollen grains effectively
• Wear wraparound sunglasses outdoors — they protect the conjunctiva from direct pollen contact and reduce eye symptoms
• Avoid mowing grass or doing garden work during pollen season; if you must — wear an N95/FFP2 mask and goggles
• Do not dry laundry outdoors during pollen season — fabrics act like a natural filter, catching pollen grains
• When driving, use air conditioning with internal air recirculation — this blocks outside pollen from entering the cabin

Remember: if you are travelling in August, check local pollen levels at your destination. Southern regions of Europe — particularly areas bordering the Pannonian Plain — tend to record very high ragweed concentrations. If you suffer from severe allergy, this is worth factoring into your holiday plans.

When to see an allergist? Immunotherapy as a long-term solution

over-the-counter medications do an excellent job of relieving symptoms, but they do not treat the underlying cause of the allergy. If you have a mugwort or ragweed allergy, it is worth considering a visit to an allergist, especially if:

• Symptoms are severe and significantly reduce quality of life despite over-the-counter treatment
• You use medication heavily or almost daily for more than four weeks a year
• You suspect seasonal asthma (cough, shortness of breath, wheezing)
• You have strong reactions to cross-reactive foods (especially celery or nuts)
• Your medication seems to be losing its effectiveness over time
• You want to permanently reduce your sensitivity through immunotherapy

Allergen immunotherapy (desensitisation)

This is the only treatment for respiratory allergy that modifies the course of the disease — it does not merely relieve symptoms but re-educates the immune system, reducing its over-reactivity to allergens. Subcutaneous immunotherapy (injections) or sublingual immunotherapy (drops or tablets) typically lasts 3–5 years. The effects persist for years after treatment ends. It requires a prescription and medical supervision, but for many patients it is life-changing — allowing them to return to a normal routine without needing daily medication.

One important note: immunotherapy is not started during the pollen season — the initial series of doses must be completed before peak allergen exposure. It is worth talking to an allergist in autumn or winter to plan therapy for the following year.

Frequently asked questions

Can I take an antihistamine tablet and a nasal steroid spray at the same time?

Yes — and this combination is actually the recommended strategy for moderate to severe allergic rhinitis. The oral antihistamine reduces systemic symptoms (itching, watering eyes), while the nasal steroid acts locally on the nasal mucosa. Together they provide better control than either product alone. Ask your pharmacist for guidance on specific products and dosing.

How long does mugwort and ragweed season last?

Mugwort pollinates from around mid-July through to September — peak season falls in August. Ragweed starts slightly later (mid-August) and can continue pollinating until the first frosts, sometimes as late as October. In total, allergy sufferers can experience symptoms for 2–3 months a year, which is why starting treatment early is so important.

Can children use Over-the-Counter intranasal corticosteroids?

Most over-the-counter intranasal steroid formulations are licensed for use from the age of 12. For younger children, a doctor's consultation and prescription are needed. Second-generation antihistamines (e.g. cetirizine) are available in child-friendly formulations for children from 2 years of age in syrup or drop form — always check the package leaflet for the correct age-appropriate dose.

I am allergic to mugwort — does that mean I will also react to ragweed?

Not necessarily, although the risk of becoming sensitised to both plants is higher than in the general population. Mugwort and ragweed share some similar allergen proteins (Amb a 1 and Art v 6 share approximately 65% amino-acid sequence similarity), but they are not identical. Many people are sensitised to only one of them. Accurate allergy tests — skin prick tests or a specific IgE blood test — will tell you precisely which allergens you react to.

Is chamomile tea safe if I have a ragweed allergy?

Use caution — chamomile (Matricaria chamomilla) belongs to the same Asteraceae family as ragweed and mugwort. For some people with a ragweed allergy, chamomile tea can worsen symptoms or trigger oral allergy reactions. If you regularly drink herbal teas and notice your symptoms worsening during pollen season, try cutting them out temporarily and see whether it brings relief.

Does a face mask help on high-pollen days?

Surgical masks filter pollen only partially. Filtering facepiece masks rated FFP2 or N95 work considerably better — they block more than 94% of particles. They are useful for essential outdoor activities on very high pollen days (mowing grass, gardening, walking in windy conditions). In everyday use, pairing a mask with wraparound sunglasses that protect the eyes gives the best overall protection.

Summary

✅ August marks the peak of mugwort and ragweed pollination — the hardest days of the year for respiratory allergy sufferers.

✅ Second-generation antihistamines (cetirizine, loratadine, fexofenadine, bilastine) are the over-the-counter foundation — take them regularly throughout the entire season, not just on bad days.

✅ over-the-counter intranasal corticosteroids (mometasone, fluticasone) are the most effective treatment for nasal symptoms — start 1–2 weeks before the pollen peak for best results.

✅ Cross-reactivity with foods (celery, carrot, melon, watermelon) is a common complication — if you have strong reactions after eating raw vegetables or fruit, make sure to discuss this with an allergist.

✅ Allergen immunotherapy is the only treatment that addresses the root cause — plan your allergist consultation outside the pollen season (autumn or winter).

✅ Reducing exposure (HEPA filters, keeping windows closed in the morning, sunglasses, changing clothes after coming home) always goes hand-in-hand with medical treatment.

✅ Do not ignore lower airway symptoms (cough, shortness of breath, wheezing) — they may indicate seasonal asthma that requires medical assessment.

Disclaimer

This article is for educational purposes only and does not replace medical or pharmacist advice. Information about medications, dosing, and indications may vary depending on individual health status, age, and current medications. Consult a doctor or pharmacist before starting or changing any treatment. over-the-counter availability of specific products varies by country — check local regulations.

Managing seasonal allergy typically involves several products at the same time — an oral tablet, a nasal spray, eye drops, and sometimes a short-term decongestant. Instead of buying each one separately from the first pharmacy you come across, put together your full treatment basket and compare the total cost across 100+ pharmacies on CheaperForDrug — because real savings come from comparing your whole basket, not just a single pack.