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What causes frequent urination in the beginning of pregnancy?

A:

Quick Answer

Frequent urination at the beginning of pregnancy is due to increased blood flow to the pelvic area and kidneys, says What To Expect. Additionally, the growing uterus puts pressure on the bladder, reducing the amount of space available to hold urine.

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Full Answer

The pregnancy hormone hCG is responsible for the increased blood flow that makes women need to urinate frequently in the first trimester of pregnancy, explains What To Expect. This urgency lessens in the second trimester, when the uterus enlarges and begins to fill the abdominal cavity. During the second trimester, the kidneys also become more efficient at removing waste, which also helps reduce this symptom. However, in the third trimester, the size of the baby causes urinary frequency and urgency to return, becoming worse around 35 weeks when its head starts to press against the bladder.

Despite the discomfort of constantly needing to use the toilet, pregnant women should not limit fluid intake in an attempt to reduce these symptoms, warns What To Expect. During pregnancy, a woman's requirement for fluids increases, and dehydration can lead to a urinary tract infection. However, avoiding caffeine is advisable due to its diuretic properties. Techniques to help empty the bladder more completely include leaning forward while on the toilet and double-voiding, waiting a moment after urination and then urinating a bit more. These techniques can somewhat increase the length of time between trips to the toilet.

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