Anal discharge can range from clear, jelly-like mucus to yellow or green pus, bloody fluid, or even oily droplets, depending on what’s causing it. A small amount of clear mucus is completely normal. It’s produced by the lining of your intestines to help move stool through, and it can sometimes show up clinging to your stool or swirling in the toilet bowl, looking a bit like snot. Anything beyond that, especially if it has color, odor, or shows up on your underwear, points to something worth investigating.
What Normal Rectal Mucus Looks Like
Your large intestine constantly produces a thick, gel-like mucus that coats its walls. This mucus protects the intestinal lining from bacteria and helps waste move along smoothly. When you notice it, it’s usually clear or slightly whitish and has a jelly-like texture. You might see a small streak of it wrapped around an otherwise normal bowel movement. This is not a cause for concern.
Clear or White Mucus in Larger Amounts
When clear or white mucus starts showing up in noticeable quantities, something is irritating the lining of your rectum or colon. Internal hemorrhoids are one common cause. They can prevent the muscles around your anus from closing completely, allowing small amounts of mucus (and sometimes traces of stool) to leak out. You might notice dampness around your anus or stains on your underwear rather than visible mucus in the toilet.
Irritable bowel syndrome can also increase mucus production without changing its color. The mucus stays clear or white but becomes more frequent or voluminous than usual.
Yellow or Green Discharge
Yellow or greenish discharge typically signals infection or significant inflammation. This type often has a thicker, pus-like consistency and may carry a noticeable odor. Sexually transmitted infections affecting the rectum are a leading cause. Gonorrhea and chlamydia can both cause proctitis, an inflammation of the rectal lining that produces discharge along with anorectal pain, a persistent urge to have a bowel movement, and a feeling that you can’t fully empty your bowels.
A more aggressive form of chlamydia called LGV (lymphogranuloma venereum) can cause particularly heavy discharge alongside rectal ulcers and bleeding. This form requires a longer course of treatment than standard chlamydia.
Bloody or Blood-Streaked Discharge
Blood in anal discharge can appear bright red, dark red, or mixed with mucus or pus. What it looks like depends heavily on the source. Hemorrhoids and anal fissures (small tears in the skin around the anus) tend to produce bright red blood, often noticed on toilet paper or coating the outside of stool.
Ulcerative colitis, a type of inflammatory bowel disease, commonly causes diarrhea mixed with blood, mucus, or pus. When the condition affects larger portions of the colon, bloody diarrhea can become severe. Crohn’s disease, the other major form of IBD, can produce similar symptoms. In both conditions, the discharge tends to be ongoing rather than a one-time occurrence, and it usually comes with abdominal cramping, urgency, and fatigue.
Bloody discharge also occurs with rectal STIs, particularly LGV and in people living with HIV who develop acute proctitis. Perianal ulcers and mucosal ulcers often accompany the bleeding in these cases.
Pus From an Abscess or Fistula
An anal fistula is an abnormal tunnel between the inside of the rectum and the skin near the anus, usually left behind after an abscess drains. The discharge from a fistula can include pus, blood, or even traces of stool. It often has a smell. You might notice it as a persistent wet spot on your underwear or see it oozing from a small opening in the skin near your anus, especially when you press on the area.
Perianal abscesses, before they drain, cause intense throbbing pain and swelling. Once they open (on their own or surgically), the pus that comes out is typically thick, yellowish or whitish, and foul-smelling. Fistulas that don’t heal on their own, or that keep producing drainage, generally need surgical repair.
Orange or Oily Discharge
An unusual type of anal leakage appears as orange or brownish-green oil. This is called keriorrhea, and it happens after eating certain fish that contain indigestible wax esters. Escolar and oilfish (sometimes sold as “white tuna” or “Japanese sea bass”) are the most common culprits. The wax esters pass straight through your digestive system unabsorbed and accumulate in the rectum, where they can leak out without any warning sensation from the sphincter. The discharge is purely oily with no water component, which makes it distinctive. It resolves on its own once the fish clears your system, and it doesn’t require medical testing.
What the Color and Texture Tell You
- Clear, jelly-like: Usually normal mucus. Larger amounts may point to hemorrhoids, IBS, or mild rectal irritation.
- Yellow or green, pus-like: Suggests infection, including STIs like gonorrhea or chlamydia, or an abscess.
- Bloody or blood-mixed: Could indicate hemorrhoids, fissures, inflammatory bowel disease, or STI-related proctitis.
- Foul-smelling pus with or without blood: Often a fistula or draining abscess.
- Orange or oily: Likely keriorrhea from eating certain oily fish.
Signs That Need Prompt Attention
Certain combinations of symptoms alongside anal discharge signal something more serious. Unexplained weight loss, persistent bleeding that doesn’t improve, or iron deficiency anemia alongside rectal symptoms warrant a colonoscopy to rule out colorectal cancer or advanced inflammatory bowel disease. Any new lump, mass, or lesion near the anus that looks unusual should be evaluated, as anal cancer can initially mimic more benign conditions.
Severe perineal pain with fever, especially in people with diabetes, can indicate a rapidly spreading infection called Fournier gangrene, which is a medical emergency. Similarly, intense rectal pain with few visible findings on the outside may point to a deep abscess that needs surgical drainage before it worsens.
How Doctors Evaluate Anal Discharge
If you seek medical care for anal discharge, the process typically starts with a digital rectal exam, where a provider inserts a gloved, lubricated finger to feel for hemorrhoids, fissures, or other structural problems. The next step is often an anoscopy: a short, lubricated tube called an anoscope is inserted about two inches into the anus, allowing the provider to visually inspect the rectal lining under light.
For suspected STIs, swabs of the discharge are sent for testing. If abnormal-looking tissue is spotted during the exam, a small biopsy may be taken. A high-resolution anoscopy uses a magnifying instrument alongside a solution that causes abnormal cells to turn white, making subtle tissue changes easier to detect. This version is particularly useful for screening for precancerous changes in people at higher risk.