JAN 04, 2026

These are the reasons why your uterus may not accept an embryo

These are the reasons why your uterus may not accept an embryo

Embryo implantation is one of the most complex processes in human reproduction.

Even a high-quality embryo requires a receptive endometrium to successfully implant.

Scientific and medical research shows that implantation failure can result from uterine, endometrial, embryonic, hormonal, or immunological factors.

1. Non-receptive endometrium

The endometrium has a specific window of implantation.

If this window is altered, implantation may fail even with a healthy embryo.

2. Chronic endometritis

Chronic inflammation of the endometrium has been associated with repeated implantation failure and often presents without symptoms.

3. Uterine structural abnormalities

Common findings include:

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  Endometrial polyps

  
  


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  Submucosal fibroids

  
  


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  Intrauterine adhesions

  
  


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  Uterine septum

  
  

These conditions interfere with proper embryo attachment.

4. Embryo quality

Genetic abnormalities or abnormal development can also prevent implantation, emphasizing the need to evaluate both embryo and uterus.

5. Immunological and coagulation factors

Abnormal immune responses or clotting disorders can reduce endometrial blood flow and implantation success.

Hysteroscopy: diagnosis and correction

Hysteroscopy allows direct visualization of the uterine cavity and correction of abnormalities in the same procedure.

It is widely recommended in cases of:

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  Repeated implantation failure

  
  


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  Recurrent pregnancy loss

  
  


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  Unexplained negative embryo transfers

  
  

Implantation failure is not a matter of chance.

With proper evaluation—especially hysteroscopy—many uterine factors can be identified and treated, improving the chances of pregnancy.