Ferroelectricity in spiral magnets is a phenomenon where electric polarization arises from magnetic ordering in materials that exhibit a strong interplay between magnetism and ferroelectricity. This study presents a phenomenological theory that describes the orientation of induced electric polarization in various incommensurate magnetic states, its dependence on temperature and magnetic field, and anomalies of dielectric susceptibility at magnetic transitions. It shows that electric polarization can be induced at domain walls and that magnetic vortices carry electric charge. The paper discusses the relationship between ferroelectricity and incommensurate magnetism, highlighting that spontaneous polarization is induced by magnetic ordering in materials like RMnO3, RMn2O5, and Ni3V2O8. These materials exhibit a giant magnetocapacitance effect, where the dielectric constant is strongly enhanced by magnetic fields. The ferroelectricity in these materials is linked to magnetic frustration, which leads to competing ferro- and antiferromagnetic interactions. The paper develops a continuum model based on symmetry arguments to explain the relationship between induced electric polarization and magnetic structure. It shows that the coupling between electric polarization and magnetization can be described by a term proportional to P M ∂M. The model is applied to various magnetic states, including sinusoidal and helical spin-density-wave (SDW) states, and explains the induced polarization in these states. The study also discusses the behavior of electric polarization in magnetic fields, showing that it can be suppressed or reversed depending on the direction of the applied field. The magnetic field dependence of the polarization is analyzed, and the results are compared with experimental observations. The paper concludes that the phenomenological approach works well in explaining the complex behavior of spiral magnets, and that magnetic fields can induce spin flops, which may have applications in magnetic devices.Ferroelectricity in spiral magnets is a phenomenon where electric polarization arises from magnetic ordering in materials that exhibit a strong interplay between magnetism and ferroelectricity. This study presents a phenomenological theory that describes the orientation of induced electric polarization in various incommensurate magnetic states, its dependence on temperature and magnetic field, and anomalies of dielectric susceptibility at magnetic transitions. It shows that electric polarization can be induced at domain walls and that magnetic vortices carry electric charge. The paper discusses the relationship between ferroelectricity and incommensurate magnetism, highlighting that spontaneous polarization is induced by magnetic ordering in materials like RMnO3, RMn2O5, and Ni3V2O8. These materials exhibit a giant magnetocapacitance effect, where the dielectric constant is strongly enhanced by magnetic fields. The ferroelectricity in these materials is linked to magnetic frustration, which leads to competing ferro- and antiferromagnetic interactions. The paper develops a continuum model based on symmetry arguments to explain the relationship between induced electric polarization and magnetic structure. It shows that the coupling between electric polarization and magnetization can be described by a term proportional to P M ∂M. The model is applied to various magnetic states, including sinusoidal and helical spin-density-wave (SDW) states, and explains the induced polarization in these states. The study also discusses the behavior of electric polarization in magnetic fields, showing that it can be suppressed or reversed depending on the direction of the applied field. The magnetic field dependence of the polarization is analyzed, and the results are compared with experimental observations. The paper concludes that the phenomenological approach works well in explaining the complex behavior of spiral magnets, and that magnetic fields can induce spin flops, which may have applications in magnetic devices.