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Week 38 · Third Trimestermild

Hot Flashes at 38 Weeks Pregnant

Feeling overheated, flushed, or experiencing sudden waves of heat is common throughout pregnancy. Increased blood flow, rising metabolic rate, and hormonal fluctuations all raise body temperature.

👶 What's Happening at Week 38

Your baby is now the size of a leek.

  • The fetus sheds the remaining vernix and lanugo into the amniotic fluid.
  • The baby swallows the amniotic fluid, contributing to meconium (first stool).
  • Firm grasp reflex is established.

🔬 Why You're Experiencing Hot Flashes at Week 38

  • Increased blood volume and circulation generates more body heat
  • Metabolic rate rises in pregnancy (the body burns more calories to support fetal growth)
  • Hormonal fluctuations — particularly in the first and third trimesters — affect the hypothalamic temperature set point
  • Progesterone has a thermogenic effect, raising basal body temperature

💊 Relief Tips for Week 38

1
Dress in LayersWear light, breathable fabrics (cotton, linen) that can be removed easily when you feel hot.
2
Keep Your Environment CoolLower the thermostat, use fans, and avoid prolonged exposure to hot environments.
3
Cold WaterSipping cold water, placing a cold cloth on the neck or wrists, or taking a cool shower provides quick relief.
4
Stay HydratedDehydration worsens overheating. Drink at least 8–10 glasses of water daily.
5
Avoid Hot Tubs and SaunasHot tubs, saunas, and prolonged hot baths can raise core body temperature to levels that may harm fetal development — avoid these throughout pregnancy.

📋 Other Week 38 Symptoms

Pelvic pressure and painBraxton Hicks (frequent)InsomniaSwellingAnxiety and excitement
See full Week 38 guide →

⚠️ Call Your Doctor If…

  • Feeling hot with a measured fever (temperature above 100.4°F/38°C)
  • Hot flashes with rapid heart rate, chest pain, or shortness of breath
  • Dizziness or fainting associated with overheating
  • Inability to cool down despite efforts

Frequently Asked Questions

Is feeling hot all the time a sign of pregnancy?

Yes — elevated basal body temperature is one of the earliest signs of pregnancy and persists throughout. The progesterone that maintains pregnancy is thermogenic.

How hot is too hot during pregnancy?

A core body temperature above 102°F (39°C) for extended periods may pose risks to fetal development, particularly in the first trimester. Fever from infection also requires prompt treatment.

Can I use a sauna while pregnant?

Saunas and hot tubs are not recommended during pregnancy. They can raise core body temperature rapidly. Warm baths (not hot) are generally safe for short durations.

Is night sweating normal during pregnancy?

Yes — night sweats are common, especially in the first and third trimesters, due to hormonal fluctuations and increased heat production.

Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult your OB/GYN or midwife about symptoms during pregnancy.