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Is it Normal to Have a Temperature When Pregnant?

by
author image Hannah Mich
Since 2007 Hannah Mich has written e-newsletters and been published in the "Missouri Journal of Health, Physical Education, Recreation and Dance." She has a Bachelor of Science in exercise science from Truman State University and a Master of Education in applied kinesiology from the University of Minnesota.
Is it Normal to Have a Temperature When Pregnant?
Different activities can increase your body temperature during pregnancy. Photo Credit JackF/iStock/Getty Images

A slightly higher than normal body temperature is common during pregnancy because of the hormone progesterone and increased metabolism. On the other hand, an infection or illness can cause your body temperature to increase too much, causing harm to you and your unborn baby. Consult your physician if your temperature is abnormally high, especially if it is accompanied by additional symptoms like chest congestion.

Basal Body Temperature

Your basal body temperature is your resting body temperature. The average basal body temperature is 98.6 degrees Fahrenheit. The best time to take your basal body temperature is when you first wake up in the morning before you get out of bed. Your BBT can be monitored orally, vaginally or rectally. For consistency, take your BBT at the same time every morning, using the same method.

Luteal Phase and Progesterone

Your menstrual cycle includes the preovulation, or follicular, phase and the luteal phase, which is the two weeks following ovulation. During the luteal phase, your body releases the hormone progesterone, which increases your basal body temperature up to one degree higher than preovulation temperatures. When you are pregnant, your body continues to release progesterone, causing your BBT to stay elevated. However, your BBT shifts closer to your preovulation temperatures as your pregnancy progresses, according to the University of Tennessee's Center for Physical Activity & Health.

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Metabolism

To meet the demands of pregnancy, your blood volume, heart rate and metabolism increase, resulting in a higher basal body temperature. To prevent overheating, your superficial blood vessels, which are close to the surface of your skin, dilate to release some of the heat. Symptoms include flushed red skin, sensitivity to heat, increased sweating and hot flashes, which are common and normal during pregnancy.

Illness

A temperature that is 101 degrees F or higher is considered a fever and indicates an infection or illness, according to the Organization of Teratology Information Specialists. A fever during pregnancy can be caused by the flu, urinary tract infection, and other bacterial and viral illnesses. Additional symptoms include pain while urinating, nausea, vomiting, headache, chest congestion and runny nose. A prolonged fever during pregnancy may increase the risk of a miscarriage and birth defects. Therefore, consult your physician immediately if you have an abnormally high temperature or a temperature above 101 degrees F.

Other Considerations

Your slightly elevated body temperature can also be the result of your lifestyle and activities during pregnancy. Stress, insomnia, exercise, hot humid weather and caffeinated beverages can increase your body temperature. To prevent overheating, avoid hot and humid environments like hot tubs, layer your clothing, exercise in well-ventilated areas, perform yoga to reduce stress and avoid consuming caffeinated beverages like coffee.

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