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Polyp – Definition, Causes and Treatment

A polyp is an abnormal tissue growth arising from mucous membranes. Polyps can occur in the colon, nose, or uterus and are usually removed endoscopically.

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Things worth knowing about "Polyp"

A polyp is an abnormal tissue growth arising from mucous membranes. Polyps can occur in the colon, nose, or uterus and are usually removed endoscopically.

What Is a Polyp?

A polyp (Latin: polypus) is an abnormal growth of tissue that projects from the surface of a mucous membrane into a body cavity. Polyps can develop in many different organs but are most commonly found in the colon (large intestine), the nasal passages, the uterus, and the stomach. Most polyps are benign (non-cancerous); however, certain types – especially those in the colon – carry a risk of developing into malignant (cancerous) tumors if left untreated.

Types of Polyps

Colorectal Polyps

Colorectal polyps grow on the inner lining of the large intestine and are the most common type. Several subtypes are distinguished:

Adenomatous polyps (adenomas): Considered precancerous lesions and should always be removed.
Hyperplastic polyps: Generally benign and rarely associated with cancer risk.
Inflammatory polyps: Often arise as a result of chronic inflammatory bowel diseases such as Crohn's disease or ulcerative colitis.
Sessile serrated lesions: A more recently classified subtype with an elevated risk of malignant transformation.

Nasal Polyps

Nasal polyps are soft, benign growths on the lining of the nasal passages or sinuses. They frequently develop in association with chronic inflammation, allergies, or asthma, and can obstruct normal breathing.

Uterine Polyps

Uterine polyps (endometrial polyps) grow from the lining of the uterus (endometrium) and may cause irregular bleeding, infertility, or lower abdominal discomfort.

Gastric Polyps

Gastric polyps are usually benign and are most often discovered incidentally during an upper endoscopy. Their risk of malignant transformation is generally low.

Causes and Risk Factors

The development of polyps is multifactorial. Known risk factors include:

Genetic predisposition (e.g., familial adenomatous polyposis, Lynch syndrome)
Advancing age (risk for colorectal polyps increases significantly after age 50)
Chronic mucosal inflammation
Smoking and excessive alcohol consumption
Unhealthy diet (high in fat, low in fiber)
Obesity and physical inactivity
Hormonal changes (in the case of uterine polyps)

Symptoms

Polyps often cause no symptoms for a long time and are discovered incidentally. When symptoms do occur, they may include:

Blood in the stool or rectal bleeding (colorectal polyps)
Changes in bowel habits (diarrhea, constipation)
Blocked nose, loss of smell, headaches (nasal polyps)
Irregular or heavy menstrual bleeding (uterine polyps)
Abdominal pain or cramping

Diagnosis

The diagnostic approach depends on the location of the polyp:

Colonoscopy: The gold standard for detecting colorectal polyps; allows simultaneous removal.
Upper endoscopy (gastroscopy): Used to detect gastric polyps.
Nasal endoscopy: Examination of the nasal cavity with a thin camera.
Ultrasound or hysteroscopy: Used to diagnose uterine polyps.
Histological examination: Every removed polyp is analyzed under the microscope to distinguish benign from malignant tissue.

Treatment

Treatment depends on the type, size, and location of the polyp:

Polypectomy: Endoscopic removal of the polyp, typically performed during colonoscopy or gastroscopy.
Surgical removal: Required for very large or inaccessible polyps.
Corticosteroids or biologics: Anti-inflammatory medications can reduce the size of nasal polyps.
Hormonal therapy: Considered in some cases of uterine polyps.
Follow-up surveillance: Regular follow-up colonoscopies are recommended after the removal of colorectal polyps.

Prevention

A healthy lifestyle can help reduce the risk of developing polyps. Recommendations include:

A high-fiber diet rich in fruits and vegetables
Avoiding smoking and excessive alcohol consumption
Regular physical activity
Timely colorectal cancer screening (colonoscopy from age 50 or earlier in those with a family history)

References

World Health Organization (WHO) – Cancer prevention and early detection: Colorectal cancer, www.who.int (2022)
American Cancer Society – Colorectal Cancer Early Detection, Diagnosis, and Staging, www.cancer.org (2023)
Snover D.C. et al. – Serrated polyps of the colon and rectum and serrated polyposis. WHO Classification of Tumours of the Digestive System, 4th edition, IARC Press, Lyon (2010)

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