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Living with Farmers lung

A lung reaction to breathing in farm dust, such as hay dust or mold spores, that causes cough and trouble breathing.

Understanding Farmers lung

Farmers lung is a type of lung inflammation (hypersensitivity pneumonitis) caused by repeatedly breathing in biological dust, such as hay dust or mold spores.

The symptoms depend on the phase. In the acute phase, people may have fever, chills, cough, trouble breathing, headache, and chest tightness. The subacute phase brings a chronic cough, breathlessness, poor appetite, and weight loss. With long exposure, the chronic phase brings severe breathlessness and lasting lung damage.

Signs & symptoms

GARD doesn't list a separate symptom list. Its summary describes:

  • Fever and chills
  • Cough
  • Shortness of breath
  • Headache
  • Chest tightness
  • Poor appetite and weight loss

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with rare disease patient organizations for support
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Which exposures should I avoid or reduce at work?
What lung tests should I have, and how often?
How can I protect my lungs at work?

Quick facts

It is caused by repeated exposure to and breathing in biological dust, such as hay dust, mold spores, or other farm products.

Also known as: farmer lung; farmer's lung; farmer's lung disease; farmers' lung; farmers' lung disease; moldy hay disease

Patient organizations

Rare-disease groups that can help

Source: NIH GARD · Farmers lungGARD ID 6427 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Farmers lung.

Explore the Farmers lung blog

Explore research for Farmers lung

Explore actively recruiting Farmers lung studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Farmers lung with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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I can help you find recruiting Farmers lung studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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