What Causes Internal Hemorrhoids? Common Risk Factors Explained

Living with internal hemorrhoids can feel like a silent, exhausting daily battle. You might be experiencing painless but alarming bleeding during bowel movements, a constant, persistent feeling of fullness, or the uncomfortable sensation of tissue prolapsing. It is a frustrating, often embarrassing problem that many people endure for years simply because they dread the idea of traditional surgery. The constant worry of discovering blood, the anxiety before every trip to the restroom, and the reluctance to discuss these symptoms even with close family members can take a significant psychological toll. You might find yourself avoiding social outings, long car rides, or physical activities you once loved simply because of the nagging discomfort.

If you are tired of relying on messy creams, suppositories, and endless sitz baths that only offer temporary relief, you are not alone. More importantly, you have effective, non-surgical options. At MIVA Medical, we specialize in advanced outpatient procedures like Hemorrhoid Artery Embolization, providing lasting relief without the painful recovery associated with traditional operations. Before exploring the solution, however, it helps to understand exactly what is happening inside your body and what factors might be contributing to your discomfort.

Understanding Internal Hemorrhoids: What Are They Exactly?

Everyone actually has hemorrhoids. In their normal, healthy state, they are simply small cushions of veins and connective tissue located in the lower rectum. These vascular cushions serve an important purpose: they help maintain bowel continence and protect the anal sphincter. The trouble begins when these blood vessels become swollen and engorged with too much blood. Internal hemorrhoids develop specifically inside the lower rectum, high enough that they lack pain-sensing nerves.

To understand this phenomenon, we must look at the anatomy of the rectum. The anal canal is divided by a landmark called the dentate line. Hemorrhoids that form above this line are internal, while those below are external. The area above the dentate line is innervated by visceral nerves, which do not sense pain, touch, or temperature in the way your skin does. They only sense stretch and pressure. This anatomical quirk is exactly why internal hemorrhoids can bleed profusely without causing a sharp, localized pain. This is why the most common first sign is bright red blood on the toilet tissue or in the bowl, rather than sharp pain.

As they worsen, however, these swollen vessels stretch their supporting tissues. Over time, the hemorrhoid may prolapse, meaning it bulges outside the anal opening, dragging the surrounding mucosal lining downward. This leads to a constant sense of pressure, irritation, and a feeling that your bowel movement is incomplete.

The Primary Culprits: What Causes Internal Hemorrhoids?

Internal hemorrhoids are ultimately caused by excessive, repeated pressure on the veins in the pelvic and rectal area. This pressure causes the blood vessels to stretch, pool with blood, and bulge. While no single factor guarantees you will develop symptoms, several common risk factors dramatically increase the likelihood:

• Chronic Constipation and Straining: This is the most frequent instigator. When you struggle to pass hard stools, the intense straining exerts heavy pressure on the delicate veins of the rectum. This is frequently driven by a modern diet severely lacking in dietary fiber and inadequate daily water intake. Without enough hydration and roughage, stool becomes compact and difficult to move. Over time, this repetitive stretching damages the tissues that hold the vascular cushions in place.
• Prolonged Sitting: Modern lifestyles involve a lot of sitting, which increases pelvic pressure. However, sitting on the toilet with your smartphone or a magazine is particularly problematic. The anatomical position of sitting on an open toilet seat causes the rectum to drop lower, placing gravity-driven stress directly on your hemorrhoidal veins. Gastroenterologists often refer to this as ‘toilet reading syndrome.’ Ideally, bowel movements should take no longer than five minutes.
• Pregnancy and Childbirth: As the uterus expands during pregnancy, it presses heavily on the veins in the pelvis, causing them to swell. Furthermore, pregnancy triggers a spike in the hormone progesterone, which naturally relaxes the walls of your veins, making them even more prone to swelling and dilation. The intense physical pushing required during labor also places immense stress on the rectal area. Our Director of Women’s Health, Dr. Silas Williams, frequently sees patients whose hemorrhoidal issues began during pregnancy and persisted long after childbirth.
• Heavy Lifting: Occupations or workouts that involve lifting heavy objects require you to brace your core. When you hold your breath and push—a technique known as the Valsalva maneuver—this sudden, intense spike in intra-abdominal pressure pushes aggressively down on the pelvic floor. Proper breathing techniques during weightlifting are essential to prevent this.
• Excess Weight and Obesity: Carrying extra weight, particularly around the abdomen, naturally increases continuous pressure on the pelvic floor and lower half of the body. This constant mechanical load makes it difficult for blood to flow easily back up to the heart, leading to venous pooling in the rectal area.
• Aging: As we get older, the connective tissues supporting our veins naturally begin to thin, lose elasticity, and weaken, making them increasingly susceptible to bulging under normal, everyday pressures.

The Progression: From Mild Discomfort to Daily Frustration

Internal hemorrhoids do not usually appear overnight; they progress through distinct stages. Medical professionals categorize them into four primary grades, which helps determine the best course of treatment.

• Grade I: The hemorrhoids are slightly enlarged and may bleed occasionally, but they do not prolapse (bulge outside the anus) at all. At this stage, you might only notice faint streaks of bright red blood on toilet paper or in the toilet bowl. This grade is typically managed with dietary changes and increased hydration.
• Grade II: The swollen tissues prolapse outside the anal opening during the intense pressure of a bowel movement, but they spontaneously retract back inside on their own once you stand up. You might feel a fleeting sensation of fullness or a mild, temporary irritation.
• Grade III: The hemorrhoids prolapse during bowel movements or physical exertion and will not go back in on their own. You have to manually push them back inside with your fingers. This stage often introduces a persistent, dull ache, mucus discharge, and localized itching (pruritus ani) due to the delicate internal tissues being exposed to the outside environment.
• Grade IV: The hemorrhoids are permanently prolapsed and cannot be pushed back inside. They remain outside the body, where they are constantly exposed to friction from clothing and daily movement. This stage is extremely uncomfortable and carries a high risk of thrombosis (painful blood clots) and strangulation (cut-off blood supply), often requiring prompt medical intervention.

Recognizing your symptoms early can prevent you from reaching the painful Grades III and IV. Many patients wait until their symptoms become entirely unmanageable before seeking help, largely out of fear of undergoing invasive surgical procedures like a traditional hemorrhoidectomy.

Breaking the Cycle: The MIVA Medical Approach

If you are dealing with persistent internal hemorrhoids, traditional advice usually involves increasing fiber, drinking more water, or using topical steroid creams. While these conservative methods are crucial first steps and excellent preventative measures, they often fail to resolve advanced cases. Historically, the next step was a painful surgery involving cutting and removing the tissue, which required weeks of excruciating recovery, severe post-operative pain, and time away from work.

Today, you have a highly effective, minimally invasive alternative. Hemorrhoid Artery Embolization (HAE) is a cutting-edge, outpatient procedure designed to treat the root cause of the bleeding without scalpels, stitches, or incisions. During HAE, an expert interventional radiologist makes a tiny pinhole in the wrist or the upper thigh. Using advanced fluoroscopic imaging guidance, they thread a microscopic catheter through your blood vessels directly to the specific arteries supplying excess blood to the hemorrhoids.

Once the catheter is in place, tiny embolic coils or microscopic particles are released to block this specific, abnormal blood flow. The results are remarkable. Deprived of their excessive blood supply, the swollen hemorrhoidal cushions naturally shrink and heal over the following weeks. Symptoms like painless bleeding, constant pressure, and prolapse dramatically resolve.

The entire procedure takes about an hour, requires only twilight sedation rather than general anesthesia, and most patients return to their normal daily activities the very next day. Because there are no open wounds in a highly sensitive area, post-procedure pain is practically non-existent compared to traditional surgery.

Take the First Step Toward Relief

Don’t let internal hemorrhoids dictate your daily routine, dictate your wardrobe, or keep you tethered to the bathroom. By understanding the underlying causes and the progression of the condition, you can take proactive steps toward healing. Whether it is adjusting your diet, modifying your toilet habits, or exploring modern minimally invasive treatments, lasting relief is entirely within your reach. Reach out to the compassionate experts at MIVA Medical today to discuss your symptoms, review your medical history, and determine if Hemorrhoid Artery Embolization is the right path for you to reclaim your comfort and your life.