The endometrium is the inner lining of the uterus where an embryo needs to implant and develop.

When the endometrium is very thin, implantation may be more difficult because the uterine lining may not provide the most supportive environment for an embryo.

A thin endometrium may be associated with:
• Reduced blood flow to the uterine lining
• Previous uterine procedures or scar tissue
• Low estrogen levels
• Chronic inflammation or infection
• Certain medications or hormonal conditions

In fertility treatment, endometrial thickness is often monitored by ultrasound before ovulation or embryo transfer. While pregnancy can still occur with a thinner lining, implantation and pregnancy rates generally tend to decrease as the lining becomes very thin.

The cause of a thin endometrium is important. Treatment depends on the underlying reason, so further evaluation may be recommended if the lining remains persistently thin.

If you are trying to conceive and have concerns about your endometrial thickness, speak with your fertility specialist for an individualized assessment.