Haemorrhoids (often known as Piles) are enlarged and engorged blood vessels in or around the back passage (anus). These may be associated with pain, bleeding, itching and feeling as if a lump or bump is hanging down. Causes: They are said to be more common in countries where the diet has traditionally been more processed and low in fibre.Those chronically straining with constipation. After or during pregnancy. Here, the baby may actually press on the main blood vessel that returns blood to the heart (the vena cava). Overweight people. People with heavy lifting jobs. Symptoms:You may notice a pain or ache around the anus and lower bowel (rectum), which can be really quite severe. There may be itching of the area. There may be bleeding from the back passage. This will be bright red blood, not usually mixed in with the motion, but often seen on the toilet paper. There is often a feeling of something coming down, or a bulge or lump at the anus. If a haemorrhoid at the outside of the anus gets a blood clot in it (thrombosed external pile) it leads to a particularly tender, hardish lump.