Understanding how your body processes waste can help you maintain better digestive health and recognize when something might be wrong.
What Your Rectum Does
Your rectum is the last 5-6 inches of your large intestine, positioned between your colon and your anal canal. Think of it as a holding area where solid waste collects before leaving your body. While storing waste, your rectum absorbs remaining water and electrolytes, further solidifying the material. It also produces mucus to help everything pass smoothly. When your rectum fills, specialized nerve fibers detect the stretching and signal your brain that it’s time for a bowel movement.
How It’s Built
Located in your pelvic cavity, your rectum has a slight S-shape with two curves. The upper curve follows your spine, while the lower one marks where your rectum becomes your anal canal. These bends help you maintain bowel control. Inside, horizontal folds called the valves of Houston create three or four chambers that regulate waste movement. The final chamber, known as the rectal ampulla, is where waste collects right before elimination.
Your rectum measures about 10-15 centimeters (roughly 5-6 inches) and can contract like a slinky when moving waste. While it’s approximately 3 inches wide like the rest of your large intestine, it stretches wider to accommodate more waste.
Common Problems
Several conditions can affect your rectum:
- Proctitis — inflammation often caused by infections or inflammatory bowel disease
- Rectal ulcers — painful sores that may bleed
- Perianal abscess — a pus-filled lump near the rectum or anus
- Colorectal polyps — growths that sometimes develop into cancer
- Rectal prolapse — when weakened muscles allow the rectum to slip out of position
- Levator syndrome — muscle spasms causing episodic pain
- Fecal incontinence — difficulty controlling bowel movements
- Obstructed defecation — trouble passing stool due to muscle or nerve problems
- Constipation and fecal impaction — hardened stool blocking the rectum
When to See a Doctor
Contact a healthcare provider if you experience rectal bleeding, persistent pain in your rectum or lower abdomen, anal itching or infection, changes in your bowel movements, constant urge to defecate, difficulty or pain when pooping, or a bulge protruding through your anus.
Diagnostic Tests
Doctors use several methods to examine rectal health: digital rectal exam (physical examination with a gloved finger), rectal culture (swab test for bacteria or viruses), stool tests, anorectal manometry (measures muscle and nerve function), defecography (imaging while attempting to defecate), barium enema (X-ray with contrast dye), proctoscopy (examination with a short scope), and flexible sigmoidoscopy (examination of the rectum and lower colon).
Maintaining Rectal Health
You can reduce your risk of rectal problems by practicing safe sex to prevent STIs, eating a whole-foods diet to prevent constipation and straining, getting regular colonoscopy screenings to detect polyps early, and seeking medical attention for persistent symptoms.
Your rectum plays a vital role connecting digestion to elimination. While rectal issues can cause discomfort and embarrassment, addressing them promptly is important. A gastroenterologist or proctologist can diagnose and treat rectal conditions effectively.
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