Colonoscopy (การส่องกล้องลำไส้ใหญ่และทวารหนัก)

A colonoscopy is a medical procedure that uses a Colonoscope—a thin, flexible, and long tube with a high-definition camera at its tip. The physician inserts the scope through the rectum to examine the entire large intestine (rectum, descending colon, transverse colon, and ascending colon) as well as the end of the small intestine. The images are displayed on a monitor, providing high accuracy for diagnosis and treatment.

Beyond visualization, physicians can perform several therapeutic tasks through the scope, such as:

• Polypectomy: Removing polyps (growths) before they turn into cancer.
• Biopsy: Taking tissue samples for laboratory analysis.
• Hemostasis: Stopping active bleeding within the colon.

Who Should Get a Colonoscopy?

1. Individuals with abnormal symptoms:

• Persistent changes in bowel habits, such as chronic constipation, diarrhea, or constipation alternating with diarrhea.
• Blood in the stool (bright red or dark/tarry) or stools with an unusually foul odor.
• Protruding tissue from the rectum during bowel movements accompanied by bleeding.
• Persistent abdominal tightness, bloating, or chronic abdominal pain.
• Feeling a lump in the abdomen, unexplained weight loss, paleness (anemia), or chronic fatigue.

2. Individuals with a family history:

Those with relatives who have had colorectal cancer or intestinal polyps.

3. Individuals aged 50 and above:

Regular screening is recommended to prevent colorectal cancer risk.

How to Prepare for a Colonoscopy

Before the Procedure:

• Follow your doctor’s instructions strictly regarding dietary restrictions and the use of laxatives. A clean colon is essential for an accurate examination.
• Bring a relative: You will likely receive a sedative/anesthetic. You are strictly forbidden from driving yourself home as the medication reduces your coordination and reaction time.

During the Procedure:

• You may feel some pressure, tightness, or mild cramping as the scope is inserted. Most patients tolerate this well; however, pain medication or sedation is often provided to ensure comfort.
• The procedure typically takes about 30 minutes.

After the Procedure:

• Most patients can resume normal eating and activities almost immediately.
• You may experience slight bloating or gas. This is normal, as air is used to expand the colon during the exam. The gas will pass naturally within a few minutes.
• If you received sedation, you will be monitored until fully awake before being discharged.
• Safety First: Do not drive or operate heavy machinery for at least 24 hours.
• Watch for Red Flags: You may see a small amount of blood in your first bowel movement. However, if you experience heavy bleeding, severe abdominal pain, a rigid abdomen, or high fever, seek medical attention immediately without waiting for your appointment.