Why is normal saline contraindicated in pregnant women?

Generally speaking, there is no such statement as “normal saline is contraindicated in pregnancy.” Pregnant women may use normal saline under the guidance of a healthcare provider. If any discomfort occurs, prompt medical consultation is recommended. A detailed analysis follows:

Normal saline is prepared by mixing sodium chloride with purified water, resulting in an osmotic pressure closely matching that of human body fluids. Its composition is pure and gentle, containing no harmful or irritating substances, and leaves no toxic residue in the body. During pregnancy, heightened bodily sensitivity may lead to symptoms such as nasal dryness or congestion, skin dryness, or mild vulvar discomfort. In such cases, appropriate use of normal saline—for cleansing or moist compresses—can gently remove local debris and hydrate mucosal and cutaneous surfaces, effectively alleviating various mild discomforts.

When used appropriately and as directed, normal saline does not impair maternal physiological function nor interfere with normal fetal development, making it well-suited to the unique physiological changes of pregnancy. However, irregular or frequent use may compromise the protective mucosal barrier and disrupt local microbial balance. Therefore, routine use should strictly follow the guidance of qualified healthcare professionals, adhering to standardized procedures and recommended frequency to better maintain maternal stability throughout pregnancy.