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There are some of hazard factors for ectopic pregnancies. However, in as many as 1/3 to 1/2 of no threat elements can be diagnosed. Risk factors include: pelvic inflammatory ailment, infertility, use of an intrauterine tool (IUD), previous exposure to diethylstilbestrol (DES), tubal surgical operation, intrauterine surgical operation (e.G. D&C), smoking, previous ectopic being pregnant, endometriosis, and tubal ligation. A previous prompted abortion does not appear to growth the hazard. The IUD does no longer growth the threat of ectopic pregnancy, however with an IUD if being pregnant happens it is more likely to be ectopic than intrauterine. The chance of ectopic being pregnant after chlamydia contamination is low. The exact mechanism thru which chlamydia increases the risk of ectopic pregnancy is unsure, even though some research suggests that the contamination can affect the structure of Fallopian tubes.