What are the causes of cervicitis?

Causes of Cervicitis

Cervicitis is most commonly caused by Chlamydia trachomatis and Neisseria gonorrhoeae, though the majority of cases—especially in women over 30 years with low STD risk—have no identifiable organism. 1

Infectious Causes

Most Common Pathogens

• Chlamydia trachomatis is the single most frequently isolated pathogen when a causative organism is identified in cervicitis cases 1, 2
• Neisseria gonorrhoeae ranks as the second most common identifiable infectious cause 1, 2
• Trichomonas vaginalis causes cervicitis, particularly in women with concurrent trichomoniasis 1, 2
• Herpes simplex virus type 2 (HSV-2) can cause cervicitis, especially during primary infection 1, 2
• Mycoplasma genitalium has emerged as a candidate etiologic agent, though standardized diagnostic tests are not commercially available 1

Emerging and Less Common Pathogens

• Mageeibacillus indolicus (formerly BVAB3) colonization of the endocervix may contribute to clinical manifestations of cervicitis, though this finding requires further validation across diverse populations 3
• Human papillomavirus (HPV) infection can produce cervical warts and is linked to cervical inflammation 1
• Group B streptococcus and other bacteria considered "normal vaginal flora" should be considered as potential pathogens when testing for routine STD pathogens is negative, particularly in cases of chronic cervicitis unresponsive to standard therapy 4
• Mycoplasma hominis and Ureaplasma urealyticum have been isolated in cervicitis cases, though their pathogenic role remains less clearly defined 5

Non-Infectious Causes

Chemical and Mechanical Irritants

• Frequent douching is associated with persistent cervicitis and should be discontinued 1, 2
• Chemical irritants from feminine hygiene products or spermicides can contribute to cervical inflammation 1, 2

Inflammatory and Idiopathic Causes

• Persistent abnormality of vaginal flora may cause ongoing inflammation 1, 2
• Idiopathic inflammation in the zone of ectopy can produce persistent cervicitis without an identifiable infectious cause 1, 2
• Cervical ectropion—a normal developmental finding in reproductive-age individuals—can cause significant vaginal discharge and inflammation despite negative infectious testing 1

Epidemiologic Context and Risk Stratification

High-Risk Populations (More Likely STD Etiology)

• Age < 25 years with sexual activity 1, 2
• New or multiple sexual partners 1, 2
• Unprotected intercourse 1, 2
• Residence in communities with high STD prevalence 1

Low-Risk Populations (Less Likely STD Etiology)

• Women over 30 years old with stable relationships are less likely to have identifiable STD pathogens 1, 2
• In this population, no organism is isolated in the majority of cases 1, 2

Critical Clinical Pitfalls

• Cervicitis can persist despite repeated courses of antimicrobial therapy for reasons that are unclear; the majority of persistent cases are not caused by relapse or reinfection with C. trachomatis or N. gonorrhoeae 1
• Do not continue empiric antibiotics indefinitely without an identified pathogen, as this has no proven benefit and risks adverse effects 1
• Wet-mount microscopy may miss Trichomonas vaginalis in 30–50% of cases; nucleic acid amplification testing (NAAT) is the preferred diagnostic method when clinical suspicion persists 1
• Gram-negative diplococci on cervical microscopy are >99% specific for N. gonorrhoeae, but sensitivity is only about 50%—a negative Gram stain cannot exclude infection 1
• Mycoplasma genitalium elicits the highest degree of cervical inflammation among common STD pathogens, with positive predictive values of 100% when ≥2 leukocytes per epithelial cell per high-powered field are observed 6