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