What causes Miscarriage?

Some miscarriages cannot be explained. Miscarriages often occur for the following reasons:

• Chromosomal abnormality (most common cause)
• Advanced maternal age
• Uterine defects
• Fibroids
• Scar tissue from a past surgery
• Insufficient progesterone (a female hormone needed to support pregnancy)
• Infection in the genital tract
• Immunologic factors that may cause blood-clotting problems or rejection of the fetus