Whate is the causes of the chronic venuos congestion in lung?

Left heart failure: When people use that term, they usually mean passive lung congestion - left heart failure is the most common cause (there's usually a diagnosis of "congestive heart failure"). Mitral stenosis and pulmonary veno-occlusive disease round out the list. Most other lung constrictive processes occur at the arteriolar level or before, so it's important to be very specific about the terminology here.

Heart failure : Not =well treated heart failure can cause chronic venous congestion.