Pregnancy represents one of the most remarkable physiological states experienced by the female body. During this process, maternal physiology undergoes extensive adaptations to meet both maternal and fetal requirements. From early gestation, the cardiovascular system exhibits marked increases in blood volume and cardiac output, leading to mild anemia as a result of physiological hemodilution. The respiratory system adapts through deeper ventilation, thereby enhancing maternal tissue oxygenation and facilitating oxygen transfer to the fetus. Renal function is significantly altered, with increased glomerular filtration rate, urinary frequency, and physiological dilatation of the urinary tract. Hematologic changes include a hypercoagulable state that serves as a protective mechanism against peripartum hemorrhage. Endocrine adaptations, mediated by placental hormones, modify maternal glucose metabolism by inducing insulin resistance, predisposing to gestational diabetes. Gastrointestinal motility decreases, resulting in reflux, heartburn, and constipation, while delayed gallbladder emptying increases the risk of cholelithiasis. Additional changes involve connective tissue stretching, pigmentary alterations of the skin, and immune tolerance mechanisms to protect the fetus. Collectively, these physiological adaptations ensure the maintenance of a healthy pregnancy and the safe progression toward childbirth.