How do internal hemorrhoids develop?

Internal hemorrhoids refer to hemorrhoids that occur inside the anus. Generally, the main causes of internal hemorrhoids are as follows: 1. Chronic constipation: Long-term constipation leads to dry and hardened stools, making defecation difficult and requiring excessive straining. This increases pressure around the anus, causing venous dilation and ultimately resulting in internal hemorrhoids. 2. Improper diet: An unhealthy diet can disrupt digestive system function, increase intestinal pressure, and lead to varicose veins around the anus, thereby contributing to the development of internal hemorrhoids. 3. Prolonged sitting: Sitting for extended periods compresses the veins around the anus, impairing blood circulation and causing venous dilation, which may eventually lead to internal hemorrhoids. 4. Pregnancy: During pregnancy, the enlarging uterus compresses the rectum, affecting intestinal motility and predisposing individuals to constipation, which in turn may trigger internal hemorrhoids.