Can you advise on where do hemorrhoids come from?

Variety of causes: Hemorrhoids are enlarged veins that exist under the lining of the rectum and anus. The primary cause of hemorrhoids is increased abdominal pressure, from chronic constipation, prolonged sitting, pregnancy and in some cases, from other diseases, such as liver disease. They are generally fleshy and soft but cause discomfort when engorged and pain if there is acute thrombosis or clotting of the vei.