What causes miscarriage? Ten to 25 percent of pregnant women suffered miscarriages. For women with recurrent early miscarriage, the doctor will usually subject her to a complete medical, physical, and genetic examination to pinpoint the problem. The risk of having another miscarriage after the first one increases. Usually, the chance of miscarriage by week is high in the first trimester of pregnancy and most women face a 9 weeks pregnant miscarriage risk that they need to be alert about. Eating foods such as papaya or drinking pineapple juice can cause internal contractions and cervix dilation leading to a miscarriage [1] [2] . Because organs, facial features, skeletal tissue and limbs are developing at this time, any negative affect on the fetus can result in serious birth defects. Miscarriage usually occurs only in the first trimester of pregnancy. Credit: iStockphoto A garden-variety cold, a sinus infection, or even a stomach virus isn't likely to affect your pregnancy . About a quarter of all women, though, will experience some light vaginal bleeding (spotting, it’s called) during their first trimester so this is not highly unusual nor is it a sign of increased risk of miscarriage. This may be the reason most couples announced a pregnancy after miscarriage risk subsided. Here are some of the factors that increase risk of miscarriage … In that case, treating the issue may help prevent a future miscarriage. A risk factor is a trait or behavior that increases a person’s chance of developing a disease or predisposes a person to a certain condition. Bleeding is often the very first sign of a miscarriage. The first trimester, or three months, of pregnancy, can present many risks to the developing fetus. First trimester. Well, it depends. “Especially in the first trimester, about 60% to 70% of miscarriages are due to the chromosomes (groups of genes, the material that tells the … Pregnant moms who have had a previous miscarriage, for example, may feel extra nervous about working out during the first trimester, and that’s completely understandable. Some studies show an increased risk to a pregnancy even if only the father smokes. Miscarriage during an early stage of pregnancy (first trimester) is very common. Dr. However, about 85% of women who miscarried carry the next pregnancy to full term. Certain miscarriage-inducing food items can trigger it. Compared to those who stopped drinking alcohol at the earliest signs of pregnancy, those who continued drinking into the first trimester were at a nearly 40 percent increased risk of miscarriage. Rarely, doctors are able to find an issue that increases the risk for a miscarriage. Hence the somewhat gray relationship between miscarriages and exercise. 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