hyperhidrosis

How Do Pregnancy Hormones Affect Excessive Sweating?

Shad Douglas

08 Aug 2025 — 1 min read

Summary

Pregnancy hormones lead to several physiological changes, including increased sweat production. This is primarily due to elevated levels of hormones such as estrogen and progesterone, which influence body temperature and blood flow, ultimately causing excessive sweating or hyperhidrosis during pregnancy.

Understanding Hormonal Changes During Pregnancy

Estrogen and Progesterone Levels

During pregnancy, the body experiences a significant increase in estrogen and progesterone levels. Estrogen, in particular, plays a crucial role in regulating body temperature. As estrogen levels rise, they can lead to vasodilation (widening of blood vessels), which increases blood flow to the skin and can result in higher body temperature and sweating [NCBI, 2014].

Increased Metabolic Rate

The metabolic rate increases during pregnancy to support the growing fetus. This heightened metabolism generates more body heat, which can lead to excessive sweating as the body attempts to cool itself down [NCBI, 2023].

Mechanisms of Sweating During Pregnancy

Thermoregulatory Changes

The hypothalamus, the part of the brain that regulates body temperature, becomes more sensitive during pregnancy. This sensitivity prompts the body to sweat more easily as a way to manage and dissipate excess heat [Healthline, 2023].

Increased Blood Volume

Pregnancy also leads to an increase in blood volume by up to 50% to provide adequate oxygen and nutrients to the fetus. This increase can enhance circulation to the skin, causing the body to produce more sweat [Mayo Clinic, 2023].

Examples and Effects of Excessive Sweating

Night Sweats

Many pregnant women experience night sweats, which are episodes of excessive sweating during sleep. They are particularly common during the first and third trimesters due to hormonal fluctuations and increased body temperature [What to Expect, 2023].

Impact on Daily Life

Excessive sweating can lead to discomfort and may require pregnant women to take extra measures, such as wearing breathable clothing or using fans and air conditioning to maintain comfort. Staying hydrated is also crucial as excessive sweating can lead to dehydration [WebMD, 2023].

Conclusion

Excessive sweating during pregnancy is a common experience due to hormonal changes and increased metabolic demands. Understanding these changes can help manage symptoms effectively, ensuring comfort and well-being throughout pregnancy.

References

[NCBI, 2014] Malinowski, A., & Całka, J. (2014). "Physiological changes in pregnancy." NCBI.
[NCBI, 2023] Nelson, L. M. (2023). "Overview of Pregnancy Metabolism." NCBI Bookshelf.
[Healthline, 2023] "Excessive Sweating During Pregnancy." Healthline.
[Mayo Clinic, 2023] "Pregnancy Week by Week." Mayo Clinic.
[What to Expect, 2023] "Night Sweats During Pregnancy." What to Expect.
[WebMD, 2023] "Pregnancy Overview." WebMD.

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