Hemorrhoids are swollen, stretched-out cushions of tissue and blood vessels in and around the anus. Everyone has these cushions naturally; they help control bowel movements and seal the anal canal shut. They only become “hemorrhoids” in the medical sense when they enlarge, slip out of position, and start causing symptoms like bleeding, itching, or pain. About 1 in 4 adults has hemorrhoids at any given time, making them one of the most common conditions people search for but rarely talk about.
How Hemorrhoids Form
The anal canal contains a network of blood vessels sandwiched between layers of smooth muscle. That muscle works like a valve, controlling blood flow in and out of the tissue. When the system functions normally, the cushions fill with blood to help seal the canal, then drain when they’re no longer needed. Hemorrhoids develop when that drainage mechanism breaks down. Blood pools in the vessels, the tissue swells, and the cushions start to bulge or slide downward.
The most common trigger is repeated pressure on the pelvic floor. Straining during bowel movements, sitting on the toilet for long stretches, chronic constipation, and heavy lifting all increase pressure in the veins around the anus. Pregnancy is a major risk factor: roughly 25 to 35 percent of pregnant women develop hemorrhoids, mostly in the third trimester and the first month after delivery. The growing uterus presses on rectal veins, progesterone relaxes the vein walls and slows digestion, and the delivery itself adds enormous strain.
Other factors that raise your risk include obesity, a low-fiber diet, a sedentary lifestyle, diabetes, high blood pressure, and having a family history of hemorrhoids. Of these, family history carries the strongest association, roughly quadrupling the odds.
Internal vs. External Hemorrhoids
Hemorrhoids fall into two categories based on where they form relative to a boundary inside the anal canal called the dentate line.
Internal hemorrhoids develop above the dentate line, inside the rectum. The tissue there has almost no pain-sensing nerves, so internal hemorrhoids are typically painless. The hallmark symptom is bright red blood on toilet paper or in the bowl after a bowel movement. You usually can’t see or feel internal hemorrhoids unless they’ve grown large enough to push through the anal opening, which is called prolapse. A prolapsed hemorrhoid can cause a feeling of fullness, mucus discharge, and irritation.
Internal hemorrhoids are graded on a four-point scale based on how far they protrude:
- Grade I: Bleeding but no prolapse.
- Grade II: Prolapse during straining but slip back in on their own.
- Grade III: Prolapse that requires you to push them back in manually.
- Grade IV: Permanently prolapsed and cannot be pushed back in.
External hemorrhoids form below the dentate line, under the skin around the anus. This skin is packed with pain-sensing nerves (branches of the pudendal nerve), which is why external hemorrhoids can hurt significantly. Common symptoms include a tender lump near the anus, itching, swelling, and discomfort that worsens with sitting.
Thrombosed Hemorrhoids
Sometimes blood inside an external hemorrhoid clots, creating what’s called a thrombosed hemorrhoid. The main sign is a firm, bluish-purple lump on or near the anus that can be extremely painful and tender to the touch. Pain is usually worst in the first 48 hours. Bleeding can occur if the lump ruptures. Most thrombosed hemorrhoids resolve on their own over one to two weeks as the clot is gradually reabsorbed, but if the pain is severe, a doctor can drain the clot in a quick office procedure during that early window when it’s most effective.
Lifestyle Changes That Help
The cornerstone of hemorrhoid management is softening your stool so you don’t have to strain. That starts with fiber. Current dietary guidelines recommend 14 grams of fiber per 1,000 calories, which works out to about 28 grams per day on a standard 2,000-calorie diet. Most people fall well short of that. Good sources include beans, lentils, whole grains, fruits, and vegetables. If you add fiber quickly, you may feel bloated at first, so increase intake gradually over a week or two and drink plenty of water to help it do its job.
Toilet habits matter more than most people realize. Spending long periods sitting on the toilet, scrolling through your phone, increases sustained pressure on the anal cushions. Aim to keep bathroom visits brief: sit down, go, and get up. Posture also plays a role. Placing your feet on a small stool so your knees rise above your hips tilts the pelvis into a position that relaxes the pelvic floor muscles and makes bowel movements easier. Lean slightly forward with your elbows resting on your knees rather than sitting bolt upright.
Regular physical activity helps by improving circulation and reducing the constipation that comes with a sedentary lifestyle. Even moderate daily walking can make a difference.
Treatments for Symptom Relief
Warm sitz baths, where you soak the anal area in a few inches of warm water for 10 to 15 minutes, can ease pain and itching. Over-the-counter creams and suppositories containing ingredients that temporarily numb or reduce inflammation provide short-term relief. These are fine for occasional flare-ups but aren’t a long-term fix.
For internal hemorrhoids that keep bleeding or prolapsing (Grades I through III), rubber band ligation is the most common office procedure. A small rubber band is placed around the base of the hemorrhoid, cutting off its blood supply. The tissue shrinks and falls off within a few days. Success rates range from 69 to 97 percent depending on the severity, and patient satisfaction in large studies sits around 94 percent. Bleeding is controlled in about 98 percent of cases. Some people experience mild pain or light bleeding afterward, but serious complications are rare. Recurrence is relatively low: about 4 percent at one year and 13 percent at five years.
Other office-based options include infrared coagulation, which uses heat to shrink the tissue, and injection therapy, where a chemical solution is injected to reduce blood flow. Both work best for smaller hemorrhoids. A meta-analysis comparing all three found that patients treated with rubber band ligation were least likely to need additional treatment down the line.
Surgery, specifically hemorrhoidectomy, is generally reserved for large Grade III or Grade IV hemorrhoids that haven’t responded to other treatments. Recovery takes longer and is more painful than office procedures, but it has the lowest recurrence rate.
When Bleeding Needs Attention
Bright red blood on toilet paper is the classic hemorrhoid symptom, but rectal bleeding can also signal other conditions, including polyps, inflammatory bowel disease, or colorectal cancer. If you notice blood that is dark red or black, bleeding that persists despite treatment, or bleeding accompanied by a change in bowel habits or unexplained weight loss, those warrant an evaluation. This is especially true if you’re over 45 or have a family history of colorectal cancer.