Which are the symptoms of Familial Adenomatous Polyposis?

Familial Adenomatous Polyposis (FAP) is a genetic condition characterized by the development of hundreds to thousands of adenomatous polyps in the colon and rectum, typically beginning in adolescence. Without surgical intervention, the primary symptom is the inevitable progression of these polyps into colorectal cancer, often manifesting through subtle gastrointestinal changes or remaining entirely asymptomatic until the disease is advanced.

What are the primary symptoms of Familial Adenomatous Polyposis?

In its early stages, Familial Adenomatous Polyposis is frequently asymptomatic, which is why clinical surveillance is critical. As the number of polyps increases, patients may experience symptoms related to the irritation of the bowel lining. Common clinical presentations include:

• Unexplained rectal bleeding or blood in the stool.


• Changes in bowel habits, such as persistent diarrhea or increased frequency.


• Abdominal pain, cramping, or a feeling of bloating.


• Unintentional weight loss or unexplained iron-deficiency anemia caused by chronic, microscopic blood loss.

How does Familial Adenomatous Polyposis progress over time?

The progression of Familial Adenomatous Polyposis is marked by the relentless growth of polyps. While the condition starts with small adenomas in the teenage years, the risk of malignant transformation increases significantly by age 30 to 40. Beyond the colon, Familial Adenomatous Polyposis can lead to extra-intestinal manifestations, including desmoid tumors, osteomas (benign bone growths), and polyps in the upper gastrointestinal tract, specifically the duodenum.

When should you seek immediate medical attention?

Because the risk of colorectal cancer is nearly 100% in untreated Familial Adenomatous Polyposis, any persistent change in bowel habits or rectal bleeding requires urgent evaluation. Immediate medical attention is necessary if a patient experiences severe abdominal pain, a complete change in stool caliber, or signs of bowel obstruction, which may indicate that polyps have transitioned into malignancy.

How do symptoms affect daily life?

Living with Familial Adenomatous Polyposis often involves managing the psychological burden of a high-risk diagnosis and the physical recovery from prophylactic surgeries, such as a colectomy. For the 147 members of the DiseaseMaps community currently navigating Familial Adenomatous Polyposis, maintaining quality of life often centers on strict adherence to endoscopic screening schedules to prevent cancer development.

Next steps

• Consult a gastroenterologist or a genetic counselor to establish a regular screening schedule.


• Connect with the Familial Adenomatous Polyposis community at DiseaseMaps.org to share experiences and coping strategies.


• Discuss genetic testing with your family members, as this is an autosomal dominant condition.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Familial Adenomatous Polyposis.


• Orphanet: Familial Adenomatous Polyposis (ORPHA:733).


• OMIM (Online Mendelian Inheritance in Man): #175100.


• The Polyposis Registry and patient advocacy groups.