Trichomoniasis

Low urgency
Very common-

Trichomoniasis is a sexually transmitted infection caused by the parasite Trichomonas vaginalis. 

Infection occurs during sexual intercourse without a condom. It is more common in young people and in people with multiple sexual partners.

In most cases, there are no symptoms. In case of symptoms, they usually occur between 5 and 28 days after unprotected sexual intercourse with the infected person. In women it is usually in the form of changes in vaginal discharge; increased discharge with a strong fishy odor is very characteristic. It may be accompanied by vaginal discomfort or itching during urination. In severe cases, the infection may spread to the tubes that connect the ovaries to the uterus, the fallopian tubes. This infection is called salpingitis and causes pain in the lower abdomen.

Diagnosis is based on medical questioning and gynecological examination. A sample from the genital area is needed for confirmatory diagnosis. Tests for other sexually transmitted infections should also be performed, as it is not uncommon to have more than one infection at a time.

Antibiotic treatment should be given to both symptomatic and asymptomatic individuals; Metronidazole or Tinidazole is often used orally for one week. Sexual partners should also be treated. 

Bibliographic references
  1. Jack D Sobel, MD. Trichomoniasis. UpToDate, Mar 16, 2016.
  2. Kissinger P. Epidemiology and treatment of trichomoniasis. Curr Infect Dis Rep 2015; 17:484.
  3. Meites E, Llata E, Braxton J, et al. Trichomonas vaginalis in selected U.S. sexually transmitted disease clinics: testing, screening, and prevalence. Sex Transm Dis 2013; 40:865.
  4. Seña AC, Miller WC, Hobbs MM, et al. Trichomonas vaginalis infection in male sexual partners: implications for diagnosis, treatment, and prevention. Clin Infect Dis 2007; 44:13.
  5. Jeanne M. Marrazzo; King K. Holmes. Infecciones de transmisión sexual: resumen y estudio clínico. Principios de Medicina Interna, 19e.Capítulo 163.
  6. Schwebke JR, Burgess D. Trichomoniasis. Clin Microbiol Rev. 2004 Oct;17(4):794-803, table of contents. doi: 10.1128/CMR.17.4.794-803.2004. PMID: 15489349; PMCID: PMC523559.
  7. Harp DF, Chowdhury I. Trichomoniasis: evaluation to execution. Eur J Obstet Gynecol Reprod Biol. 2011 Jul;157(1):3-9. doi:10.1016/j.ejogrb.2011.02.024. Epub 2011 Mar 25. PMID: 21440359;PMCID: PMC4888369.
  8. Edwards T, Burke P, Smalley H, Hobbs G. Trichomonas vaginalis:Clinical relevance, pathogenicity and diagnosis. Crit Rev Microbiol. 2016 May;42(3):406-17. doi: 10.3109/1040841X.2014.958050. Epub 2014 Nov 10. PMID: 25383648.
Author
Dr. Josep Estadella
Copyright
© TeckelMedical 2026

Symptoms

    Genital discharge with fishy odor


    Foamy vaginal discharge


    Yellow/greenish-yellow vaginal discharge


    Itch when passing urine


    Female genital itching

Symptoms to watch out for

High fever (102.2 ºF or more)
Severe belly pain
Discharge of whitish fluid (pus)

Self-care

Reduce alcohol consumption.
Consult with your primary care physician regarding the prescription of antibiotics.
Notify your sexual partner or partners so that they can get treated.
Use condoms for oral, anal, and vaginal intercourse.