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Metritis – A Complete Patient‑Friendly Guide

Overview

Metritis (also called uterine infection or puerperal metritis when it occurs after childbirth) is an inflammation of the uterine lining (endometrium) that is usually caused by bacterial infection. It is most common in women during the postpartum period but can also affect non‑pregnant women, especially those with intra‑uterine devices (IUDs) or after gynecologic surgery.

• Who it affects: Primarily women of reproductive age; postpartum metritis occurs in roughly 5‑10 % of vaginal deliveries and up to 20 % after cesarean sections (CDC, 2022).
• Prevalence: In the United States, about 300,000 women are hospitalized each year for postpartum infections, with metritis accounting for ~30 % of these cases (National Hospital Discharge Survey, 2021).
• Why it matters: Untreated metritis can lead to severe infection, sepsis, infertility, or chronic pelvic pain.

Symptoms

Symptoms can appear within 24‑72 hours after delivery or, in non‑postpartum cases, develop gradually over days to weeks. The intensity ranges from mild discomfort to life‑threatening sepsis.

Typical postpartum symptoms

• Fever: Temperature ≥38 °C (100.4 °F), often spikes in the evenings.
• Uterine tenderness: Pain on palpation of the lower abdomen or uterus.
• Foul‑smelling lochia: Discharge that is brown‑yellow or purulent rather than the normal pink‑white lochia.
• Lower abdominal or pelvic pain: Cramping that may radiate to the back or thighs.
• Increased uterine size: The uterus feels larger than expected for the postpartum day.
• General malaise: Fatigue, chills, headache, or muscle aches.

Symptoms in non‑postpartum women

• Abnormal vaginal bleeding or spotting.
• Persistent pelvic pain or pressure.
• Fever or chills.
• Foul‑smelling vaginal discharge.
• Painful intercourse (dyspareunia).
• Urinary symptoms (frequency, urgency) if infection spreads.

Causes and Risk Factors

Metritis is an infection, most frequently polymicrobial, involving both aerobic and anaerobic bacteria.

Common causative organisms

• Streptococcus pyogenes (Group A Strep) – highly virulent, can cause rapid sepsis.
• Escherichia coli – common gut flora that can ascend from the vagina.
• Staphylococcus aureus (including MRSA).
• Enteric anaerobes: Bacteroides, Peptostreptococcus.
• Polymicrobial mixes are typical in postpartum cases.

Risk factors

• Delivery method: Cesarean section (particularly emergency C‑section) vs. vaginal birth.
• Prolonged labor or ruptured membranes: >18 hours increases bacterial exposure.
• Invasive procedures: D&C, hysteroscopy, IUD insertion/removal.
• Pre‑existing genital infections: Bacterial vaginosis, chlamydia, gonorrhea.
• Maternal comorbidities: Diabetes, obesity (BMI > 30 kg/m²), anemia.
• Immunosuppression: HIV, corticosteroid therapy, chemotherapy.
• Poor perineal hygiene or colonization with Group A Strep.

Diagnosis

Timely diagnosis relies on a combination of clinical assessment and laboratory testing.

Clinical evaluation

• History: recent delivery, surgeries, IUD use, symptom timeline.
• Physical exam: uterine size, tenderness, fundal height, presence of foul discharge.
• Vital signs: fever, heart rate, blood pressure, respiratory rate.

Laboratory and imaging studies

• Complete blood count (CBC): Elevated white blood cell count (>12 × 10⁹/L) indicating infection.
• C‑reactive protein (CRP) & erythrocyte sedimentation rate (ESR): Markers of systemic inflammation.
• Blood cultures: Obtained before antibiotics if sepsis is suspected.
• Uterine discharge culture: Helps identify specific pathogens and antibiotic sensitivities.
• Ultrasound: Transabdominal or transvaginal scan to rule out retained placental tissue, abscess, or fluid collections.
• Endometrial biopsy (rare): Considered when chronic infection is suspected.

Treatment Options

Prompt antimicrobial therapy is the cornerstone of care. Treatment is tailored to the setting (inpatient vs. outpatient) and severity.

Antibiotic regimens

• First‑line (inpatient): Ampicillin + Gentamicin + Metronidazole (covers Gram‑positive, Gram‑negative, and anaerobes) – 48‑72 h IV, then oral step‑down.
• Alternative (beta‑lactam allergy): Clindamycin + Gentamicin + Metronidazole.
• Outpatient (mild cases): Oral amoxicillin‑clavulanate + metronidazole for 10‑14 days.
• Adjust based on culture results; treat MRSA with vancomycin or linezolid if indicated.

Adjunctive therapies

• Uterine evacuation: Manual removal of retained products or placenta fragments if ultrasound shows them.
• Drainage of abscess: Image‑guided percutaneous or surgical drainage.
• Supportive care: IV fluids, antipyretics (acetaminophen), analgesics.
• Blood transfusion: If severe anemia develops.

Lifestyle and supportive measures

• Rest and adequate sleep.
• Maintain good perineal hygiene; change pads frequently.
• Stay hydrated; aim for 2‑3 L of fluid daily unless fluid‑restricted.
• Balanced nutrition with protein, iron, and vitamin C to support healing.

Living with Metritis

Even after symptom resolution, many women wonder how to return to normal life safely.

Daily management tips

• Medication adherence: Finish the entire antibiotic course, even if you feel better.
• Follow‑up appointments: Typically within 48‑72 hours of discharge, then weekly until the uterus returns to baseline.
• Monitor uterine involution: Use a measuring tape to track fundal height; a rapid decrease is reassuring.
• Pain control: Ibuprofen 400‑600 mg every 6‑8 hours (unless contraindicated).
• Breastfeeding: Most antibiotics used for metritis are compatible with lactation; discuss with your provider.
• Activity: Light walking is encouraged; avoid heavy lifting (>10 lb) for at least 2 weeks.

Psychosocial considerations

Post‑partum infection can be emotionally distressing. Seek support from partners, postpartum support groups, or a mental‑health professional if you experience anxiety, depression, or feelings of inadequacy.

Prevention

Many risk factors are modifiable.

• Labor & delivery practices:
  • Administer prophylactic antibiotics before cesarean incision (standard of care per ACOG).
  • Minimize the duration of ruptured membranes; consider amniotomy only when necessary.
  • Use aseptic technique for internal fetal monitoring.
• Pre‑pregnancy screening: Treat bacterial vaginosis, chlamydia, or gonorrhea before conception.
• Post‑delivery care:
  • Promptly empty the bladder; catheterize only when required.
  • Encourage early ambulation.
  • Educate on normal vs. abnormal lochia.
• Contraceptive considerations: If you have a history of recurrent uterine infection, discuss alternative methods with your clinician; IUDs should be inserted using sterile technique.
• General health: Optimize blood sugar control in diabetics, achieve a healthy weight, and quit smoking.

Complications

Without appropriate treatment, metritis can progress to serious conditions.

• Sepsis and septic shock: Life‑threatening systemic response; reported in up to 2 % of severe postpartum cases.
• Pelvic abscess: May require surgical drainage.
• Endomyometritis: Extension of infection to the myometrium, increasing risk of hemorrhage.
• Infertility or subfertility: Scarring (synechiae) of the uterine cavity can impair implantation.
• Chronic pelvic pain: Persistent pain lasting >6 months after infection.
• Secondary hemorrhage: Due to uterine atony or retained infected tissue.

When to Seek Emergency Care

References

• American College of Obstetricians and Gynecologists (ACOG). “Practice Bulletin No. 183: Postpartum Hemorrhage.” 2022.
• Centers for Disease Control and Prevention (CDC). “Surveillance for Healthcare‑Associated Infections.” 2022.
• Mayo Clinic. “Postpartum infection (uterine infection).” Updated 2023.
• National Institute of Child Health and Human Development (NICHD). “Maternal Infections.” 2021.
• World Health Organization (WHO). “Guidelines for the prevention and treatment of postpartum infections.” 2020.
• Wang, R. et al. “Incidence and outcomes of postpartum metritis after cesarean delivery.” *Obstetrics & Gynecology*, 2021;138(4): 765‑772.

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