Though a specific cause for miscarriage cannot be identified, almost 70
percent of first-trimester miscarriages are caused by chromosomal anomalies.
Other probable causes could include infection or exposure to environmental
or industrial toxins.
In some cases, the cause is diabetes, thyroid disease, or an autoimmune
Very rarely a woman will miscarry after undergoing a diagnostic test, such
Physical trauma, incurred during accidents, may cause a miscarriage. In
other cases, substance abuse or smoking is to blame.
Researches tally 10 to 25 percent of all
Chemical pregnancies, for instance, occur when a pregnancy is lost shortly
after implantation, resulting in bleeding around the time of a woman's expected
In many cases, a woman does not recognize she has conceived when she
experiences a chemical pregnancy.
In fact, many women learn they had a miscarriage during a routine prenatal
visit. Sometimes no embryo is seen on ultrasound.
What Should I Do?
Bleeding is often the very first sign of a miscarriage.
Some women will experience some light vaginal bleeding during their first
trimester so this is not highly unusual nor is it a sign of increased risk of
If the bleeding is heavy, you should see your health care provider, this may
be a sign of miscarriage. Other common symptoms include cramps and fluid or
tissue passing from the vagina.
While you are miscarrying, your bleeding will become heavy and the cramping
will become extremely painful.
If you experience severe pain or if you are at risk of an ectopic (tubal)
pregnancy - a pregnancy in which the fetus develops outside the womb - risk
factors include a previous ectopic, current IUD use, prior pelvic infection, or
infertility - you should seek medical help immediately.
An ectopic pregnancy is a medical emergency.