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Ovulatory factor: refers to all those alterations in ovulation, which can occur due to hormonal imbalances or any disorder in the ovaries.
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Uterine factor: includes different affectations in the uterus, which interfere with the correct implantation of the embryo and the proper development of the pregnancy.
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Tubal factor: refers to any damage to the fallopian tubes, which makes it difficult for the sperm to travel through and unite with the egg.
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Embryonic factor: alterations in the development or implantation of the embryo.
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Male factor: problems with sperm concentration, motility and shape, which affect their ability to fertilize the egg.