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The most common ones: a persistent cough that sometimes brings up dark or discoloured mucus, a sore or scratchy throat, nasal congestion or a runny nose, dull headaches, a heavy fatigue that makes even simple tasks feel harder, and occasional mild body aches

Gu W, Yuan Y, Wang L, et al

But lets put things into perspective

Hypersensitivity pneumonitis (HP) is an inflammatory disease caused by inhaling organic dust or, in rare cases, chemical substances that trigger hypersensitivity reactions