Increased cervical mucus viscosity

"Increased cervical mucus viscosity" is not a molecular target, receptor, enzyme, or protein. Instead, it describes a physiological state where the consistency of the cervical mucus becomes thicker and less permeable. This change in physical property is primarily regulated by hormonal fluctuations—specifically an increase in progesterone after ovulation—which causes the mucus to become more viscous and form an effective barrier against sperm penetration and pathogens[1][5]. Conversely, estrogen reduces this viscosity during the fertile window to facilitate conception. The underlying molecular components responsible for these changes are large glycoproteins called mucins (such as MUC5AC, MUC5B), water content regulated by ion channels like CFTR and CLCA1, and post-translational modifications such as sialylation of mucin proteins[2][6]. However, "increased cervical mucus viscosity" itself does not refer to any single molecule or druggable entity but rather an emergent property resulting from these molecular processes. Because this entry refers to a property/state rather than a discrete biological target suitable for direct pharmacologic intervention or biomarker development—and because it lacks specificity regarding any particular molecule—it should be flagged as incorrect for use in structured drug-target databases.

Other names

Thickened cervical mucusHigh-viscosity cervical mucusCervical mucus thickening

Progestins increase cervical mucus viscosity, creating a physical barrier to sperm and thus preventing fertilization[1].