Sometimes someone you trust, even your doctor, will suggest these might have
caused your loss, but they aren't sure. I think sometimes even medical
professionals will speculate when they can't narrow down a sure cause just to
give you something to go on. I've investigated these things, and found no
properly documented research studies on these. That does not mean it did not
cause your loss, but it is not very likely. Most unexplained miscarriages are
(For those things that definitely don't cause miscarriage, no matter what
ANYBODY says, see the Myth page.)
Group Strep B--35% of all women have this at some point, and if you
are pregnant when you test positive, Strep B is usually left
untreated until close to delivery time. This will maximize the affect of the
antibiotic to protect the baby during delivery. Strep B can infect a baby as it
passes down the vaginal canal and cause serious problems, but if there were any connection between Strep B and miscarriage,
doctors would not leave it untreated in pregnant women until the last few weeks.
Fibroids--the only way a fibroid could cause a miscarriage is if the
egg tried to implant on it. That loss would be so early you probably would not
have even been late for your period. Fibroids can, however, if they are very
large, complicate a pregnancy by making it difficult for the baby to get head
down. A c-section may be necessary.
Scar Tissue--This can cause difficulties getting pregnant, as the egg
may have a hard time navigating the bands of tissue to find an implantation
spot, but this would not even get to the point that hCG would be produced, and
you would not know you had fertilized an egg.
Endometriosis--This condition itself should not cause miscarriage,
although some doctors speculate that it can throw off the hormones enough to
cause an early loss. Most of us who have terrible painful periods have some
endometriosis. It is more likely to be an infertility problem than a miscarriage
one. Pregnancy actually improves endometriosis.
Tuna Fish or Mercury--You can read more on this under news,
but mercury levels would have to be extraordinarily high to cause miscarriage,
and no amount of tuna would cause this. If you work directly with mercury in
your job, you should be checked regularly. The greater risk is for birth defects
in live babies.
Controlled diabetes--If you are on insulin or are regulating your
blood sugar, as long as your levels are normal, you should not increase your
miscarriage risk. This can complicate a pregnancy, but not end one.
Controlled thyroid--If you have a diagnosed thyroid disorder and are
taking medication, you should be monitored periodically to make sure your dose
should not be changed. Only if you get dramatically off could this affect your
History of STDs--Sexually Transmitted Diseases in your past could
cause scar tissue and lower your fertility, but would not cause miscarriage.
Prescription Drugs--There are only a handful of drugs that can cause
the baby to die--most notably some epilepsy drugs and methotrexate, which is
used to end ectopic pregnancies or to perform early abortions. While many drugs
are not supposed to be taken during pregnancy, they do not cause miscarriage,
but increase the risk for birth defects.
Herbal remedies--This is such a large group, I hate to be general, but
you should avoid all herbal drugs since their potency is not regulated. The
following herbs can interrupt pregnancy (still rarely, but it can happen) if
taken within two weeks of ovulation: dong quai, blue cohash, cotton root bark,
pennyroyal, or tansy.