Differences Between Anal Cancer and Hemorrhoids

Cancer is widely perceived as an especially terrifying disease. When individuals experience unusual or uncomfortable physical symptoms, many immediately suspect they may have cancer. In reality, although certain conditions share clinical features with cancer, they differ significantly in nature and prognosis. Anal cancer and hemorrhoids, for instance, are two conditions frequently confused with one another.

Distinguishing Anal Cancer from Hemorrhoids

Hemorrhoids are benign vascular lesions resulting from dilation and tortuosity of the venous plexus beneath the mucosa of the distal rectum and anal canal, or beneath the perianal skin. They can occur at any age and account for over 80% of all anorectal disorders. Based on anatomical location, hemorrhoids are classified as internal, external, or mixed. The most common clinical manifestations include painless rectal bleeding, prolapse of hemorrhoidal tissue, anal discomfort, or anal pain. Hemorrhoids are a benign condition managed within proctology.

Anal cancer refers to a malignant tumor arising below the dentate line and extending to the anal verge—encompassing both anal canal and perianal skin cancers. Its precise etiology remains unclear, though chronic inflammatory conditions (e.g., anal fistulas, condyloma acuminatum) and autoimmune disorders are considered contributing factors. Early-stage anal cancer often presents with nonspecific or subtle symptoms.

Characteristic Features of Hemorrhoids

1. Rectal bleeding:
The hallmark early symptom of internal hemorrhoids includes jet-like, dripping, or toilet-paper-streaked bleeding. Blood is typically bright red. External hemorrhoids rarely cause bleeding.

2. Sensation of heaviness or dragging pain:
This is the primary symptom of painful external hemorrhoids. Internal hemorrhoids are generally painless unless complicated by infection, strangulation, or necrosis—conditions that may provoke severe, persistent dragging discomfort.

3. Prolapse:
A predominant feature of moderate-to-advanced internal hemorrhoids, prolapse occurs due to progressive enlargement of hemorrhoidal nodules, leading to separation of the mucosa and submucosa from the underlying anal sphincter. During defecation, these nodules descend below the dentate line and protrude beyond the anal canal.

4. Pruritus (itching):
Recurrent prolapse in advanced internal hemorrhoids may cause anal sphincter relaxation and increased mucosal secretions, resulting in perianal moisture, soiling, pruritus, and even eczema. Severe cases may lead to excoriation, burning pain, and pruritic discomfort. Chronic blood loss may also cause iron-deficiency anemia, manifesting as dizziness, anorexia, and constipation—additional early indicators of hemorrhoidal disease.

Signs and Symptoms of Anal Cancer

Some patients with anal cancer may not exhibit overt bleeding. Instead, they commonly report persistent anal pain accompanied by a pronounced sensation of rectal fullness (tenesmus) and frequent, unrelenting urges to defecate—often caused by tumor mass effect obstructing the anal canal and triggering abnormal neural stimulation. Thus, even in the absence of bleeding, new-onset anal pain or tenesmus warrants heightened vigilance and prompt medical evaluation—including diagnostic imaging and biopsy—to confirm or exclude anal cancer and initiate timely treatment.

We hope the above information is helpful. Wishing you good health and happiness.