Symptoms of Anal HPV Infection
Most anal HPV infections are completely asymptomatic and have no signs or symptoms 1. This is a critical point—the majority of people with anal HPV will never know they have it because the infection produces no noticeable manifestations.
When Symptoms Do Occur
When anal HPV does cause symptoms, the clinical presentation depends on whether low-risk or high-risk HPV types are involved:
Visible Anal Warts (Low-Risk HPV Types 6 and 11)
- Visible warts on the perianal skin or within the anal canal 1, 2
- Bleeding (often the most common presenting symptom) 3, 4
- Itching or pruritus 4, 5
- Pain or discomfort 4, 5
- Anal discharge 4
- Palpable mass or tags that patients may feel themselves 4
- Non-healing ulcers 4
Important distinction: Perianal warts (on the skin around the anus) are different from intra-anal warts (inside the anal canal). Intra-anal warts occur predominantly in those with receptive anal intercourse, while perianal warts can occur in anyone regardless of sexual practices 2.
High-Risk HPV and Anal Intraepithelial Neoplasia (AIN)
High-risk HPV types (16,18,31,33,35) that cause precancerous changes (AIN) or early anal cancer are typically asymptomatic 6, 3. When advanced disease develops:
- Bleeding (often mistakenly attributed to hemorrhoids, causing diagnostic delay) 4
- Pain
- Fecal incontinence
- Fistulae
- Inguinal lymphadenopathy (in advanced cases) 4
Critical Clinical Pitfalls
The biggest pitfall is attributing anal bleeding to hemorrhoids without proper evaluation 4. This commonly delays diagnosis of anal cancer. Any persistent anal symptoms warrant thorough examination, particularly in high-risk populations (MSM, people with HIV, women with history of cervical/vulvar HPV disease).
Another key point: The presence of perianal warts should prompt examination of the anal canal with anoscopy, as concurrent intra-anal warts are common and represent a frequent cause of treatment failure and recurrence 7.
High-Risk Populations to Consider
Symptoms should be taken more seriously in:
- MSM with or without HIV infection 6
- People with HIV infection 6
- Women with previous HPV-related gynecologic disease 6, 8
- Immunosuppressed individuals 3
Digital anorectal examination (DARE) should be performed annually in persons with HIV and MSM with history of receptive anal intercourse to detect early masses 6, even in the absence of symptoms, as most HPV-related disease is asymptomatic until advanced.