But, when the procedure fails after a lot of effort then there must be some problem that is restricting the eggs from being fertilized with sperm. These reasons could be anything as it also depends on the person to person but the average cause that has been faced by one till today includes endometriosis, low egg quality, low sperm quality, hormonal imbalance, unhealthy lifestyle, PCOD, etc. Know your infertility because of this post and about the cost of IVF in Senegal as well.