Pregnancy alone does not normally cause pain when you pee. If urination hurts, the most likely explanation is a urinary tract infection, which affects roughly 18% of pregnant women in the U.S. Pregnancy makes you significantly more vulnerable to these infections, and they need prompt treatment because the risks during pregnancy are higher than usual.
Why Pregnancy Increases UTI Risk
Your urinary tract goes through major physical changes during pregnancy. Rising levels of estrogen and progesterone change the tissue lining your bladder, making it more susceptible to bacteria. The bladder muscle relaxes and stretches, increasing its capacity but also making it harder to empty completely. As your uterus grows, it pushes the bladder upward and forward, distorting its shape and compressing the tubes that drain urine from your kidneys. All of this creates an environment where bacteria can linger and multiply more easily.
The bacterium responsible for 80% to 90% of UTIs during pregnancy is the same one that causes most bladder infections outside of pregnancy: E. coli. The difference is that the physical changes of pregnancy give it a much better foothold.
What Painful Urination Feels Like With a UTI
A burning or stinging sensation during urination is the hallmark symptom. You may also feel a constant urge to pee even when your bladder is nearly empty, notice pain or tenderness in your lower abdomen or back, or see that your urine looks cloudy, darker than usual, or tinged with blood. Some women describe a strong, unpleasant smell. In more severe cases, fever, chills, nausea, and vomiting can develop, which typically signals the infection has reached the kidneys.
It Could Also Be a Yeast Infection
Yeast infections are also common during pregnancy and can cause a mild burning sensation when you urinate. The key difference is location. A yeast infection centers on the vagina and vulva, producing itching, swelling, and a thick white discharge with no odor. A UTI centers on the urinary tract itself, with stronger urgency to urinate, lower abdominal pain, and changes to the appearance or smell of your urine rather than vaginal discharge.
Bacterial vaginosis, an overgrowth of bacteria in the vagina, is another possibility. It can cause painful urination along with itching and a noticeable odor, but typically produces a thin, grayish discharge rather than the thick white discharge of a yeast infection. Since these conditions require different treatments, getting the right diagnosis matters.
Why Treatment During Pregnancy Is Urgent
Outside of pregnancy, a mild UTI is uncomfortable but rarely dangerous. During pregnancy, the stakes are much higher. Left untreated, a lower urinary tract infection has up to a 40% chance of progressing to a kidney infection (pyelonephritis). For comparison, that risk drops to 3% to 4% with proper treatment. A kidney infection during pregnancy is a serious medical event that often requires hospitalization.
UTIs during pregnancy are also linked to preterm birth. A large retrospective study found that women with a UTI had a 40% higher risk of delivering before 37 weeks, and this association held regardless of which trimester the infection occurred in. Kidney infections carried an even higher risk, nearly doubling the chance of very early delivery (before 32 weeks). Women infected with multiple bacterial species had a preterm birth rate of nearly 29%.
These risks are why prenatal care includes routine urine screening, even if you feel fine.
Silent Infections With No Pain at All
Between 2% and 10% of pregnant women have significant bacteria in their urine without any symptoms whatsoever. This condition, called asymptomatic bacteriuria, is one reason your provider tests your urine at prenatal visits. Without screening, these silent infections carry the same 30% to 40% risk of turning into a kidney infection later in pregnancy. The American College of Obstetricians and Gynecologists recommends screening all pregnant patients and treating confirmed cases with a short course of antibiotics, typically lasting five to seven days. A follow-up urine culture is often done after treatment to confirm the bacteria are gone.
What You Can Do for Relief
If you suspect a UTI, contact your provider rather than trying to manage it on your own. Antibiotics are the only way to clear the infection, and several options are considered safe during pregnancy. Your provider will choose one based on the specific bacteria found in your urine culture and may adjust if initial lab results show the bacteria aren’t responding.
While you wait for your appointment or for antibiotics to take effect, increasing your water intake can help. Research on women with recurrent UTIs found that drinking an additional 50 ounces of water per day cut the frequency of infections roughly in half. Staying well hydrated helps flush bacteria from your urinary tract and may ease some of the burning. Cranberry juice is a popular remedy, but studies have not found strong evidence that it prevents or treats active infections.
Avoid holding your urine for long periods. Emptying your bladder frequently prevents bacteria from multiplying, and leaning forward slightly while on the toilet can help you empty more completely.
Symptoms That Need Immediate Attention
Some symptoms signal that an infection may have spread to your kidneys or that something more serious is happening. These include fever, pain in your back or along your side (flank pain), blood in your urine, nausea or vomiting, and urine that smells unusually strong or looks visibly cloudy. Any pain during urination that persists or worsens deserves a call to your provider, but these particular signs warrant same-day evaluation. During pregnancy, even mild urinary symptoms are worth reporting at your next visit since catching an infection early is the simplest way to prevent complications.