Precisely why hemorrhoids develop is unknown. Researchers have identified a number of reasons to explain hemorrhoidal swelling, including the simple fact that people's upright posture places a lot of pressure on the anal and rectal veins. Aging, obesity, pregnancy, chronic constipation or diarrhea, excessive use of enemas or laxatives, straining during bowel movements, and spending too much time on the toilet are considered contributing factors.Pharmascience medicine stop causing hemorrhoids and very good work on that.