The causes of hemorrhoidal bleeding are mostly due to increased intra-abdominal pressure, and the stool rubs through the mucosal tissue of the hemorrhoid mass, causing bleeding during defecation or blood on the toilet paper, with a few cases showing喷射状 bleeding.
1. Hematochezia caused by hemorrhoids: Due to dry stool and the anal canal being stretched and torn, bleeding is very common in daily life. At the same time, anal fissure is also a common cause of hematochezia, characterized by bright red blood, usually with less bleeding, mainly stained with toilet paper, accompanied by severe anal pain during defecation, with slight pain relief after defecation, and then severe pain again, often lasting for several hours.
2. Constipation, alcohol consumption, and spicy food are the main triggers of hemorrhoidal bleeding. Once mixed bleeding occurs, it is necessary to keep the stool soft, inject oil into the anal canal or insert suppositories to protect the damaged mucosa, and the bleeding can usually stop on its own.
3. Anal and rectal inflammatory diseases (abscesses, anal sinusitis, ulcerative colitis, dysentery) cause inflammation of the hemorrhoidal veins, making the vessel wall脆化, and secondary expansion and congestion into hemorrhoids.
4. In addition to anal and rectal diseases, gastrointestinal diseases, systemic diseases, etc., can also cause the appearance of hematochezia. Some patients, although they have discovered that they have hematochezia, do not pay attention because there is no pain or itching. Experts at Shenzhen Baohui Hospital point out: This is a very wrong and very dangerous view. It is necessary to seek medical attention at a professional hospital as soon as possible when bleeding symptoms are found.
5. Elderly and weak individuals may have relaxed and weak anal sphincter muscles or the anal surgery has destroyed the complete structure of the sphincter muscles, causing anal incontinence, prolapse of the anal mucosa, and friction damage leading to hematochezia.
6. Patients with hypertension, benign prostatic hyperplasia, asthma, chronic bronchitis, pulmonary heart disease, liver cirrhosis, and obesity are more prone to develop hemorrhoids.
7. There are two causes of hemorrhoid postoperative bleeding: primary bleeding and secondary bleeding.
Primary hemorrhage: ①During the ligation operation of internal hemorrhoids, the mucosa above the dentate line is resected too much and fails to stop bleeding completely. Due to the rich blood vessels in the mucosa and the fact that internal hemorrhoids themselves are a disease of abnormal vascular hyperplasia, it is easy to cause persistent bleeding; ②During the ligation operation of internal hemorrhoids, due to rough handling during ligation, the hemorrhoid nodule mucosa is torn off and fails to stop bleeding completely. Or the active bleeding point is not treated in time; ③During the ligation operation of internal hemorrhoids, due to the ligation line not being tied tightly, the blood supply of the internal hemorrhoids is not completely blocked, and the residual end of the internal hemorrhoids continues to bleed; ④During the ligation operation of internal hemorrhoids, due to the residual end of the internal hemorrhoids being left too short, the ligation line slips off, causing the wound surface to open and continue to bleed; ⑤On the day of the operation, defecation causes the ligation line to slip off, the wound surface to tear, and the wound surface to bleed continuously; ⑥Wound damage, which often occurs during the necrosis and shedding period of internal hemorrhoids. If the stool is dry and defecation is too forceful, it can cause wound damage and bleeding, or due to the vascular embolism at the base of the hemorrhoid nodule not being firmly established, the root of the ligation line is over-tugged or the residual end of the hemorrhoid nodule is trimmed, causing wound surface bleeding.
Secondary hemorrhage: In cases with good blood supply and larger internal hemorrhoids, there are often small arteries above and around the hemorrhoids. When the hemorrhoids fall off, it is easy to damage the small arteries and cause bleeding. When the internal hemorrhoids necrotize and fall off, if excessive force is used during defecation, coughing, carrying heavy objects, etc., which increases friction, the base of the hemorrhoids may become embolized, and the thrombus in the blood vessels may be flushed off, causing the vessels to open and bleed.