Pregnancy is an important factor in the outcome of interstitial pneumonias. The outcome for sarcoidosis and rheumatoid disease is favourable as a rule, and these disorders have little influence on the progress of the disease. Idiopathic pulmonary fibrosis or fibrosis complicating scleroderma or dermatopolymyositis requires careful management considering the frequent complications at foetal level. During systemic disorders, recourse to corticosteroid-cyclophosphamide regime is possible from the second trimester. Drug induced pneumonias remain rare, do not influence pregnancy and most often only require the arrest of the incriminated drug.