Diseases in pregnancy encompass various medical conditions that can impact the health of both the mother and the developing fetus. Conditions like gestational diabetes, preeclampsia, and placenta previa pose risks. Infections such as urinary tract infections, group B streptococcus, and sexually transmitted infections need careful management. Preexisting conditions like hypertension, thyroid disorders, and autoimmune diseases can also require special attention during pregnancy. Regular prenatal care, medical supervision, and appropriate interventions are crucial to ensure the well-being of both the pregnant individual and the baby, minimizing potential complications and promoting a healthy pregnancy.