Spring Pollen: What It Actually Does in the Airway

Pollen is, by airborne standards, enormous. Most grains never get anywhere near the deep lung — they're caught by nasal hairs, the upper airway and the mucus blanket, exactly as the system is designed to do. Which raises an obvious question: if the filtering works, why does spring feel like that?

The reaction is the problem, not the particle

In a sensitised person, the immune system treats harmless plant protein as a threat. Mast cells release histamine and other mediators, blood vessels dilate, mucus production climbs sharply and nerve endings fire. The streaming, itching, sneezing and congestion are all your own response, not damage done by the grain.

That's also why antihistamines work at all. They don't remove pollen; they interrupt the reaction to it.

Telling it from a cold

People lose weeks to this confusion every spring.

• Itching — eyes, nose, palate. Colds don't generally itch. This is the single most useful discriminator.
• Duration — a cold resolves in seven to ten days. Six weeks of symptoms in April is not an infection.
• Fever — allergy doesn't cause it.
• Pattern — worse outdoors, worse on dry windy days, better after rain washes the air.

Timing within the season

Tree pollen comes first, typically early spring. Grass follows into early summer, and weeds including ragweed arrive later. If you reliably suffer in one window and not others, you've learned something useful about which you react to, and a proper allergy test can confirm it.

Counts also move through the day, generally rising in the morning and peaking from late morning into afternoon, with rain knocking them down temporarily.

Where herbs sit in this

Be realistic. Traditional respiratory botanicals like mullein have a long history of use for chest complaints, and no controlled human trial behind them for allergy specifically. They are not antihistamines and shouldn't be positioned as one.

If your spring is genuinely miserable, the interventions with real evidence are the boring ones: antihistamines, nasal corticosteroid sprays used consistently rather than reactively, and for severe cases immunotherapy. A pharmacist can walk you through the first two in five minutes.

When it's worth seeing someone

If symptoms reach into the chest — wheezing, tightness, breathlessness rather than just nose and eyes — that deserves assessment rather than another box of tablets. Allergic asthma is common and treatable, and it's frequently dismissed for years as bad hay fever.