2020年9月2日星期三

hemorrhoids wiki,Factors of hemorrhoids

    Hemorrhoids are divided into internal hemorrhoids, external hemorrhoids, and mixed hemorrhoids. Internal hemorrhoids are pathological changes and (or) abnormal displacements of the anal vascular pad. External hemorrhoids are pathological expansion and thrombosis of the subcutaneous venous plexus far from the dentate line. Mixed hemorrhoids are the fusion of the internal hemorrhoidal venous plexus and the corresponding external hemorrhoidal venous plexus. The main pathogenic factors are: (1) Occupational factors: standing for a long time, sitting for a long time, squatting for a long time, long-term weight-bearing operation, which affects venous return, slows the return of blood in the pelvic cavity, causes hemorrhoidal veins to stasis and expands, and the anal cushion hyperplasia and hypertrophy move downward. Hemorrhoids (2) Dietary factors: long-term overeating, excessive drinking, low-fiber diet, etc. may stimulate the anus and rectum congestion, and promote the expansion of venous plexus into hemorrhoids. (3) Disease factors: chronic diarrhea (colorectitis, bacillary dysentery, indigestion, etc.), chronic constipation, pregnancy, childbirth, increased abdominal pressure (prostatic hypertrophy, emphysema, pulmonary heart disease, etc.), portal hypertension (cirrhosis of the liver) , Congestive heart failure), etc. may cause anorectal congestion or blood return disorder, blood stasis leads to increased capillary permeability, tortuous expansion of vascular plexus, hyperplasia and hypertrophy of the anal cushion. (4) Anal canal defect: When the anal canal defect affects the closure of the anus, the local mucosal tissue will fill the defect compensatoryly, gradually proliferate and prolapse, forming hemorrhoids. (5) Genetic factors: The hemorrhoidal vein wall is congenital weak, prone to flexion and expansion of the hemorrhoidal venous plexus, but this view is quite controversial.

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