The primary signs and symptoms of interstitial lung disease are: 
Shortness of breath at rest or aggravated by exertion
Dry cough
 When to see a doctor By the time symptoms appear, irreversible lung damage has often already occurred. Nevertheless, it's important to see your doctor at the first sign of breathing problems. Many conditions other than interstitial lung disease can affect your lungs, and getting an early and accurate diagnosis is important for proper treatment.