Autumn has a distinctive respiratory signature, and it catches people out because they associate breathing trouble with either spring pollen or winter colds. Three separate things overlap in the same few weeks.
Mould spores
Wet leaves, compost, damp basements and anywhere condensation has been left alone all become spore sources as temperatures drop and moisture rises. Outdoor mould counts frequently peak in autumn, and indoor sources become more relevant as the house is sealed up.
Mould allergy looks a lot like other allergies — congestion, sneezing, irritated eyes, sometimes wheeze — and it's less often identified because people aren't looking for it. If your worst weeks are reliably October rather than April, that's a clue worth following up.
Ragweed
Weed pollen peaks late across much of the country, ragweed most prominently. Anyone assuming pollen season ended in June can spend six weeks blaming the wrong thing.
The first-heating dust surge
This one is almost comic in its predictability and almost never recognised. Ductwork and radiators accumulate dust all summer while the system sits idle. The first cold evening, the heating comes on and pushes months of accumulated fines through the house in a couple of hours.
The result is a cough or irritated throat appearing the same week the weather turned, which nearly everyone attributes to catching something.
Why mucus feels different now
Mucus is largely water, and its usefulness depends on consistency — thin enough for cilia to move, thick enough to trap particles. Autumn pushes it toward thick from two directions at once: heating begins drying indoor air, and people drink less than they did in summer heat without adjusting for it.
Thick mucus clears poorly, which is felt as congestion that won't shift regardless of how much you cough. The productive lever is rarely producing less — it's thinning what's there. Fluids, indoor humidity in the 30 to 50 percent range, and steam all work on consistency.
Huffing rather than coughing
Hammering away with hard coughs inflames the airway and achieves less than you would expect. The technique used in respiratory physiotherapy is a huff: draw in a moderate breath, then push it out hard through an open mouth, the way you would to steam up a window. Do that two or three times and follow with a single cough. More gets moved, and the airway takes less punishment doing it.
When to get it checked
The usual rule of thumb is that a cough past three weeks has earned an appointment. Move faster than that for any blood, for a fever arriving alongside discoloured phlegm, for breathlessness, for a wheeze you didn't have before, or for weight coming off without explanation. And if the same autumn pattern returns dependably every single year, that is a thing to have identified rather than a thing to keep tolerating.
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