- Medical conditions prior to pregnancy which could influence weight loss or gain: cystic fibrosis, hyperthyroidism, renal insufficiency1, proteinuria1, cerebral palsy, lupus erythematosus; rheumatoid arthritis, Crohns disease (severity and other autoimmune diseases evaluated case by case), ulcerative colitis, maternal congenital heart disease (patients are often underweight); hypertension treated with medication2,