Can Infections During Pregnancy Trigger Premature Birth?

Infections during pregnancy, especially when left untreated, can trigger premature birth by initiating uterine contractions. Upper respiratory illnesses, which are common during the winter months, and urinary tract infections during pregnancy alter the body's immune response, thereby increasing this risk. With early diagnosis and proper medical intervention, we can largely prevent these infections from harming your baby or complicating your pregnancy.

• Infections can stimulate uterine contractions by increasing inflammatory cells in the body.
• A urinary tract infection (UTI) during pregnancy is one of the most common triggers for premature labor.
• The flu and common cold during pregnancy can elevate this risk due to high fever.
• Signs of premature birth include regular contractions, your water breaking, and pelvic pressure.
• Drinking plenty of water and adhering to hygiene practices are fundamental steps in preventing infections.

What is the Link Between Infection and Premature Birth During Pregnancy?

During pregnancy, an expectant mother's immune system naturally suppresses itself so that the body does not reject the baby. This physiological change makes women more susceptible to viruses and bacteria, which tend to increase during the winter. When microorganisms enter the body, they trigger the immune system to release inflammatory substances called cytokines. An increase in these substances in the blood can stimulate the uterine muscles, leading to premature contractions and the dilation of the cervix.

Urinary tract infections and vaginal infections during pregnancy significantly raise the risk of premature birth because they develop directly near the cervix. Similarly, systemic illnesses that cause high fever, such as the flu, can disrupt the body's balance and trigger early labor. This does not mean that every infection will inevitably result in premature birth. However, infections that are left untreated, progress, and spread throughout the body are always a serious risk factor that must be taken into account.

Causes and Risk Factors

The primary reasons for an increased risk of infection during pregnancy are changing hormone levels and a growing uterus. An increase in the hormone progesterone relaxes the muscles in the urinary tract, slowing down the flow of urine. As the growing uterus puts mechanical pressure on the bladder, it can prevent the bladder from emptying completely. Urine that remains inside creates an ideal environment for bacteria to multiply, paving the way for infections. Spending too much time in enclosed, crowded spaces during the winter months also increases exposure to respiratory viruses transmitted through droplets.

• Inadequate fluid intake and the habit of holding urine for long periods.
• A history of recurrent urinary tract or vaginal infections.
• The presence of gestational diabetes, which weakens immunity and raises infection risk.
• Spending long periods in enclosed, poorly ventilated environments.
• Insufficient attention to personal hygiene, particularly toilet hygiene.

Symptoms of Infection and Premature Birth During Pregnancy

The symptoms of an infection vary depending on the affected area. Urinary tract infections typically present with a burning sensation during urination, a frequent urge to urinate, pain in the lower abdomen, and cloudy urine. If the infection spreads to the kidneys, back pain, nausea, and a high fever are added to the picture. Respiratory infections manifest as nasal congestion, a sore throat, a dry or productive cough, fatigue, and fever. The signs of premature birth that these infections can trigger are quite different, and expectant mothers need to be closely familiar with these warning signs.

• Regular contractions felt in the abdomen four or more times an hour that do not subside with rest.
• A constant pressure in the pelvic area, feeling as though the baby is pushing down.
• A dull ache in the lower back that does not ease when you change positions.
• A sudden increase in the amount of vaginal discharge, or a change in its color (pink, brown, or bloody).
• Amniotic fluid leaking slowly or gushing out suddenly (your water breaking).

Diagnosis: How is it Diagnosed at the Hospital?

When you visit the hospital with a suspected infection or premature labor during pregnancy, your doctor will first perform a detailed physical examination. Vital signs such as your temperature, pulse, and blood pressure will be measured. To diagnose a urinary tract infection, a complete urinalysis and a urine culture will be requested. The culture test is the gold standard for identifying the type of bacteria causing the infection and determining which antibiotic it is sensitive to. For respiratory infections, a throat culture or blood tests showing infection markers may be performed.

If there are signs of premature birth, you will be connected to an NST (Non-Stress Test) monitor to track uterine contractions and your baby's heart rate. Cervical length is measured via ultrasound to evaluate whether there is any shortening or dilation of the cervix. When necessary, a vaginal culture is taken to check for the presence of a local infection. These tests are of great importance for finding the source of the infection as well as determining the extent of the premature birth risk.

Treatment: Home Care and Hospital Treatments

Infection treatment during pregnancy involves safe medications that will not harm the baby. For urinary tract infections, pregnancy-safe antibiotics prescribed by your doctor based on the culture results are used. Treatment is generally expected to last 5 to 7 days. It is essential to take the medication exactly as prescribed for the full duration, even if your symptoms disappear. For the flu or a cold during pregnancy, symptomatic treatment is usually applied; fever reducers, plenty of fluids, and bed rest are recommended.

If the infection has triggered premature labor, treatment will continue in a hospital setting. Intravenous medication (tocolysis) may be started to stop the contractions. Steroid injections are administered to accelerate the baby's lung development. During home care, expectant mothers can speed up recovery by drinking at least 2.5 liters of water daily, eating a diet rich in vitamin C, and resting. You should strictly avoid using herbal teas, painkillers, or antibiotics without your doctor's approval.

Complications and Risk Groups

Untreated infections can lead to serious complications for both the mother and the baby. A simple urinary tract infection can turn into a kidney infection (pyelonephritis). This condition is dangerous enough to cause kidney damage and blood poisoning (sepsis) in the expectant mother. When an infection-induced premature birth occurs, the baby may face respiratory distress, feeding difficulties, and a need for neonatal intensive care.

Expectant mothers with weakened immune systems, chronic kidney conditions, or those expecting multiple babies are in a higher risk group for infections. Additionally, in early-age pregnancies, since the body's physiological development is not yet complete, the susceptibility to infections and premature birth may be greater. For women spending the final months of their pregnancy during the winter, staying away from crowded places and closely monitoring infection symptoms are critical steps to prevent these complications.

When Should You See a Doctor?

Correctly interpreting the signals your body sends during pregnancy is vital. A mild runny nose or a one-off slight groin pain usually resolves with rest. However, there are certain emergency signs indicating that an infection is progressing or that premature labor has begun. If you experience any of these symptoms, you must visit a healthcare facility without delay or call 112 for emergency services.

• A high fever exceeding 38°C (100.4°F) that does not come down despite fever reducers.
• Severe burning during urination, blood in the urine, or intense pain radiating to the back.
• A sudden gush of fluid from the vagina or a continuous leak.
• Regular contractions accompanied by abdominal tightening that repeat more than four times an hour.
• Vaginal bleeding or a noticeable decrease in your baby's movements.

The Process at BHT CLINIC

At BHT CLINIC İstanbul Tema Hastanesi, your pregnancy follow-up, infection control, and delivery process are managed with the utmost care. When your symptoms begin, our specialist physicians in the Gynecology and Obstetrics department will swiftly plan all necessary tests. Thanks to our hospital's advanced laboratory infrastructure, your urine and blood cultures are processed quickly, and the most appropriate treatment protocol that will not harm your baby is determined.

In cases of premature birth risk or sudden infections, we are by your side at all times with our 24/7 emergency department and fully equipped neonatal intensive care unit. Bringing your pregnancy follow-up file, a list of your medications, and previous test results with you when coming to the hospital will speed up the process. To safeguard both your health and your baby's, make sure not to skip your regular check-ups.

Frequently Asked Questions

Does a urinary tract infection during pregnancy harm the baby?

If left untreated, the infection can trigger premature birth or lead to low birth weight. However, when treated promptly with appropriate antibiotics under a doctor's supervision, it does not cause direct harm to the baby.

Does getting the flu during pregnancy lead to premature birth?

While the flu virus itself does not directly cause premature birth, the high fever and severe coughing associated with the flu can stimulate uterine contractions. Therefore, the flu during pregnancy should be monitored closely, and fever must be kept under control.

How can you recognize premature labor contractions?

Premature labor contractions are typically regular and do not go away with rest or a change of position. You will feel periodic gathering and tightening in your abdomen, accompanied by a rhythmic pain radiating to your back.

Is it safe to use antibiotics during pregnancy?

Not all antibiotics can be used during pregnancy, but there are safe antibiotics, such as the penicillin and cephalosporin groups, which are proven not to harm the baby. Your doctor will prescribe the safest medication based on the type of infection.

What should I do to protect myself from infections during pregnancy?

You should drink at least 2.5 liters of water a day, avoid holding your urine, and wipe from front to back after using the toilet. Additionally, staying away from crowded places during the winter months and washing your hands frequently will help prevent respiratory infections.

To ensure a healthy pregnancy and take precautions against infection risks, you can reach out to our specialist physicians via our BHT CLINIC appointment page.

This article is for informational purposes only; please consult your physician for diagnosis and treatment.