```html

Fever and Chills During Pregnancy

What is Fever and Chills During Pregnancy?

Fever is a body temperature higher than the normal range of 36.5–37.5 °C (97.7–99.5 °F). In pregnancy, a temperature of **38 °C (100.4 °F) or higher** is generally considered a fever. Chills are the sensation of feeling cold and shivering that often accompany an elevated temperature, as the body tries to raise its core temperature.

Both fever and chills are not diseases themselves; they are signs that the body is fighting an infection, responding to inflammation, or reacting to another physiological stressor. Because pregnancy changes the immune system and cardiovascular dynamics, the same trigger can feel more intense, and the implications for mother and fetus can differ from the non‑pregnant state.

Common Causes

Below are the most frequent conditions that can produce fever and chills in a pregnant person. Each item includes a brief explanation of why it occurs.

• Urinary Tract Infection (UTI) – Bacteria ascend the urinary tract, causing localized inflammation that can quickly lead to fever and systemic chills.
• Influenza (Flu) – Seasonal flu viruses trigger a robust immune response, often with high fever, chills, body aches, and respiratory symptoms.
• COVID‑19 – SARS‑CoV‑2 infection may present with low‑grade to high fever, chills, cough, and loss of taste or smell.
• Listeria monocytogenes infection – A food‑borne bacterium that is especially concerning in pregnancy; it can cause fever, chills, gastrointestinal upset, and may lead to severe fetal infection.
• Gastroenteritis – Viral (e.g., norovirus) or bacterial (e.g., Salmonella) infections of the gut cause fever, chills, vomiting, and diarrhea.
• Viral or bacterial pneumonia – Lung infection leads to systemic inflammation, fever, and shaking chills.
• Chorioamnionitis – Infection of the fetal membranes (often after 20 weeks gestation) presents with fever, uterine tenderness, and fetal tachycardia.
• Pyelonephritis – A severe kidney infection that produces high fever, rigors, flank pain, and may cause sepsis if untreated.
• Rheumatic fever or other autoimmune flares – Systemic inflammation can cause fever and chills, though less common in pregnancy.
• Hyperthyroidism (thyroid storm) – Excess thyroid hormone can raise metabolic rate, leading to fever, sweating, and tremor.

Associated Symptoms

Fever and chills rarely occur in isolation. The following symptoms often accompany them and can help narrow the underlying cause:

• Headache or facial pressure
• Muscle aches (myalgia) or joint pain
• Upper or lower respiratory symptoms: cough, shortness of breath, sore throat
• Gastrointestinal upset: nausea, vomiting, diarrhea, abdominal cramping
• Urinary complaints: burning with urination, increased frequency, flank pain
• Pelvic pain or uterine tenderness (possible sign of chorioamnionitis)
• Rash or skin lesions (could point to viral exanthems or bacterial infections)
• Changes in fetal movement (decreased activity may signal fetal distress)
• Feeling unusually fatigued or light‑headed

When to See a Doctor

Pregnancy heightens the risk of complications from even modest infections, so err on the side of caution. Contact your obstetric provider or go to urgent care if you experience any of the following:

• Fever ≥ 38 °C (100.4 °F) lasting more than 24 hours
• Severe chills with rigors (shaking that does not stop)
• Fever accompanied by uterine tenderness, pelvic pain, or foul‑smelling vaginal discharge – possible chorioamnionitis
• Persistent vomiting or inability to keep fluids down (risk of dehydration)
• Severe abdominal or flank pain
• Rapid heart rate (maternal > 110 bpm) or feeling faint/dizzy
• New or worsening shortness of breath
• Decreased fetal movements (especially after 28 weeks)
• Any sign of rash, especially if it’s spreading quickly or involves the face

Diagnosis

Evaluation typically follows a step‑wise approach:

1. Medical History & Physical Exam – Provider asks about the duration of fever, associated symptoms, recent sick contacts, travel, food intake, and obstetric history. A gentle abdominal exam assesses uterine tenderness.
2. Vital Signs – Temperature, blood pressure, heart rate, respiratory rate, and oxygen saturation are recorded.
3. Laboratory Tests
   • Complete blood count (CBC) – looks for elevated white blood cells (infection) or anemia.
   • Urinalysis & urine culture – rule out UTI or pyelonephritis.
   • Blood cultures – if fever is high or sepsis is suspected.
   • CRP or ESR – nonspecific markers of inflammation.
   • Specific viral panels (influenza, COVID‑19 PCR) when respiratory symptoms dominate.
4. Imaging (when needed)
   • Renal ultrasound – for suspected pyelonephritis without radiation exposure.
   • Chest X‑ray with abdominal shielding – safe in pregnancy if pneumonia is a concern.
   • Fetal ultrasound – to assess fetal well‑being if maternal infection could affect the baby.
5. Special Tests – In cases of suspected listeriosis, a blood culture for Listeria is ordered; for suspected thyroid storm, thyroid function tests are obtained.

All diagnostic steps are chosen to balance the need for accurate information with fetal safety.

Treatment Options

Treatment is tailored to the cause, gestational age, and severity. Below are the main categories.

1. General Supportive Care

• Hydration – oral rehydration solutions or IV fluids if unable to drink.
• Rest – adequate sleep helps the immune system.
• Fever reduction – acetaminophen (Tylenol) is the first‑line antipyretic in pregnancy (up to 3 g/day). NSAIDs such as ibuprofen are avoided after 20 weeks unless specifically indicated.
• Cool compresses or a lukewarm bath to bring temperature down safely.

2. Antibiotic Therapy (Bacterial Infections)

• UTI / Pyelonephritis – Oral nitrofurantoin (avoid in late third trimester) or amoxicillin; IV ceftriaxone for severe cases.
• Listeria – Intravenous ampicillin (often combined with gentamicin) is the standard of care.
• Chorioamnionitis – Broad‑spectrum IV antibiotics (ampicillin + gentamicin) plus labor monitoring; delivery may be indicated.
• Antibiotics are selected based on culture results when available.

3. Antiviral Therapy

• Influenza – Oseltamivir (Tamiflu) is safe in all trimesters and reduces complications if started within 48 hours.
• COVID‑19 – Mild cases may be managed with supportive care; moderate‑to‑severe disease may require monoclonal antibodies or antivirals (e.g., nirmatrelvir/ritonavir) after specialist consultation.

4. Specific Management for Other Causes

• Thyroid storm – beta‑blockers, propylthiouracil, and supportive cooling.
• Autoimmune flares – corticosteroids may be indicated under specialist guidance.

5. Monitoring the Fetus

When maternal fever exceeds 38.5 °C, fetal monitoring (non‑stress test or biophysical profile) is often performed, especially after 24 weeks, because high maternal temperatures have been linked to neural tube defects and other congenital anomalies.

Prevention Tips

Many of the infections that cause fever and chills are preventable with simple habits:

• Hand hygiene – Wash hands with soap for at least 20 seconds after using the bathroom, before meals, and after touching pets.
• Food safety – Avoid unpasteurized dairy, soft cheeses, deli meats, and undercooked poultry or eggs to reduce listeria risk.
• Vaccinations – Get the seasonal flu shot and the COVID‑19 vaccine (including boosters) as recommended by your obstetrician.
• Urinary health – Drink plenty of water, empty bladder regularly, and urinate before and after sexual activity.
• Stay up‑to‑date with prenatal visits – Early detection of urinary or cervical infections can be treated before fever develops.
• Avoid close contact with sick individuals – Keep distance from anyone with a fever, cough, or known contagious illness.
• Travel precautions – When traveling abroad, follow CDC travel health notices and practice food & water safety.

Emergency Warning Signs

If any of the following occur, seek emergency medical care (call 911 or go to the nearest emergency department) immediately:

• Fever ≥ 39 °C (102.2 °F) that does not improve with acetaminophen
• Severe chills with uncontrollable shivering (rigors)
• Persistent vomiting or inability to retain any liquids for > 12 hours
• Sudden, severe abdominal or pelvic pain, especially with vaginal bleeding or discharge
• Rapid heart rate (> 120 bpm) or low blood pressure (systolic < 90 mmHg)
• Shortness of breath, chest pain, or feeling faint
• Decreased fetal movements (no movement for > 2 hours in a previously active pregnancy)
• Unexplained rash with fever (possible meningococcal or severe viral infection)

Bottom Line

Fever and chills during pregnancy signal that the body is fighting something—most often an infection that needs prompt attention. While many causes can be managed safely with antibiotics, antivirals, or supportive care, some (such as listeriosis or chorioamnionitis) carry higher risks for the baby and require urgent treatment. Maintaining good hygiene, staying vaccinated, and seeking medical evaluation early are the best ways to protect both mother and fetus.

References: Mayo Clinic, CDC, NIH, WHO, Cleveland Clinic, American College of Obstetricians and Gynecologists (ACOG) practice bulletins.

```