The endometrium is the tissue lining the inside of the womb. During each menstrual cycle, it grows in preparation for an embryo to attach. If this growth is less than expected, the lining may be described as thin.
For people preparing for IVF, doctors often use a thickness below 7 mm as a reference. This measurement is only one part of the assessment. The stage of the cycle and the person’s overall fertility findings also help guide treatment decisions.
A thin lining can raise concerns, but pregnancy may still be possible. This blog explores the reasons behind limited lining growth, the tests used to investigate it, and the care options available.
What is Thin Endometrium?
The thickness of the uterine lining varies throughout your menstrual cycle. It is thinner during the early follicular stage and thickens in the later stage, in preparation for egg implantation. The normal endometrial thickness, conducive to pregnancy, is 8mm or more. The chances of pregnancy decline when the thickness is below 6mm. While there is a correlation between a thin endometrium and pregnancy, remember that it can also be a symptom of an underlying issue. Damage to the uterine lining can occur due to various reasons. This makes identifying the cause of the thinness important for bringing the thickness of the endometrial lining to normal levels for pregnancy.
Thin Endometrium and Pregnancy
A thin endometrium cannot provide the required support for pregnancy. When the uterine lining is too thin, it does not provide a strong anchor for the fertilised egg. This leads to failure to conceive. If implantation does occur, miscarriage can occur due to the thin uterine lining. If the pregnancy holds, it could lead to deficiencies that affect the growth of the foetus. Early detection and treatment of a thin endometrium can help you realise your dream of parenthood.
Causes of a Thin Uterine Lining
The most common cause of a thin uterine lining is hormonal imbalance, specifically low oestrogen levels. Polycystic Ovary Syndrome (PCOS) can also lead to a thin endometrium due to high androgen levels. Age affects hormone production, with oestrogen levels declining as you grow older. The blood vessels in the endometrium lose their flexibility and do not heal well with age, which ultimately leads to the lining becoming thinner. The thickness of the lining is dependent on blood flow and problems with the blood vessels or circulation can lead to thinning.
Other causes of a thin uterine lining include autoimmune diseases, lack of proper nutrition, STDs and other infections, and the use of certain oral contraceptives.
The main factors that may affect the growth of the uterine lining are explained below:
- Low estrogen levels: Estrogen helps the lining grow. When levels are low, the lining may not develop sufficiently.
- Scar tissue inside the uterus: Scarring can sometimes form after procedures such as a dilation and curettage (D&C) or uterine surgery. These scars may prevent parts of the lining from growing normally. Adhesions inside the uterus are sometimes called Asherman’s syndrome.
- Long-lasting infection or inflammation: Conditions such as chronic endometritis—inflammation of the uterine lining—or genital tuberculosis can damage the lining and affect its growth.
- Reduced blood supply: Blood carries the oxygen and nutrients the lining needs to grow. Reduced blood flow may contribute to poor development, although it is not always the main cause.
- Certain medicines: Some hormonal contraceptives keep the lining thin as part of their normal effect. Fertility medicines such as clomiphene can also make the lining thinner in some women, even when used as prescribed.
Symptoms of a Thin Endometrium
The common signs of a thin uterine lining include light or irregular menstruation. If you notice your periods becoming lighter or more irregular than before, consult a doctor as soon as possible. The inability to conceive is also a symptom of a thin endometrium, since it is unable to support egg implantation, or miscarriage occurs due to the thin uterine lining.
The thickness of the lining is commonly evaluated through a transvaginal ultrasound. Other diagnostic tests include sonohysterography, which uses a saline infusion to create a sonogram of the uterine cavity, and hysteroscopy, in which a thin tube is inserted into the uterus via the cervix to view the lining.
Some women may notice the following changes, depending on the underlying cause:
- Lighter or shorter periods: Menstrual bleeding may be lighter than usual or last fewer days.
- Changes in periods: Irregular cycles or spotting may occur, but these can have many other causes.
- Difficulty getting pregnant: A thin lining may reduce the chance of an embryo attaching to the uterus, although pregnancy is still possible.
Treatment of Thin Endometrium
If you wish to start a family, a good way to prepare is to make healthy lifestyle changes. This can improve the health of your reproductive system, including the uterus. However, if the doctor diagnoses that you do not have normal endometrial thickness for a successful pregnancy, there are various treatment options available for a thin endometrium.
Hormonal therapy:
Oestrogen and progesterone might be prescribed to thicken the endometrium.
Platelet-rich plasma (PRP):
This fluid is rich in growth factors and can be infused into the uterus to improve endometrial thickness.
Endometrial scratch:
This is a minor procedure that involves gently scratching the endometrial lining to stimulate growth.
Balanced Diet:
Ensuring a diet rich in fresh fruits, vegetables, and whole grains can help. You can also include foods rich in iron, such as beetroot, spinach, beans and pumpkin seeds.
Supplements:
L-arginine and Vitamin E are known to improve the thickness of the uterine lining. You can consider other nutritional supplements to ensure that you get the required vitamins and minerals.
Physical activity:
Increasing your physical activity through regular exercise can improve blood circulation and thicken the lining.
Massage:
A trained massage therapist can help improve blood circulation and strengthen muscles, which can help improve the thickness of the uterine lining.
Stress management:
Stress can affect hormone levels and thin the endometrium, so it’s important to get enough rest.
If you have been trying to conceive without success or have observed symptoms of a thin endometrium, visit your nearest Oasis Fertility Clinic. You can also get support from our live chat facility or call 1800-3001-1000 for immediate assistance.
