Some less severe cases of lung disease is treatable and can be cured if it's caught soon enough.
But more severe cases of lung disease may not be treatable depending on how bad the lung disease is.
The sooner you catch the lung disease and the sooner you treat the lung disease the higher chance you have at getting the lung disease treated.
If you have scarring that happens in interstitial lung disease then that cannot be reversed or cured.
Treatment can help some people even with severe lung disease and can help improve the persons breathing and quality of life but it's only temporary.
That's why it's important to get treated as soon as possible for the lung disease to prevent it from progressing too far.