Symptoms of brief or severe (acute) hypersensitivity pneumonitis often occur 6-8 hours after exposure to the foreign substance. Symptoms may include:
- cough, and
- shortness of breath.
Symptoms of long-lasting (chronic) HP include:
- gradual onset of shortness of breath (especially with activity),
- unusual fatigue,
- loss of appetite, and
- unintentional weight loss.