Most Common Causes of Miscarriage


While there are many reasons for a miscarriage and most of them being beyond our control, most of the women and many couples who have had experienced a miscarriage want to know the specific reasons behind such a devastating event to avoid any future complications.

Depression, fear, anger, guilt and emotional repercussions are just some of the difficult aspects of having a miscarriage. Getting insight into the most common causes of miscarriage will help in delivering a healthy and full-term baby. Here are some of the most common causes of miscarriage explained.

Chromosomal Abnormalities

Having any problems with the chromosomes of the egg or sperm is known to be the single most reason for a miscarriage. While some abnormalities with the chromosomes may result in birth defects (such as the Down syndrome which happens due to defects in trisomy 21) but are still compatible with life; other disorders with chromosomes are just incompatible with life and genetically the development just stops resulting in a miscarriage. Further, miscarriages due to chromosomal abnormalities are more in women aged over 35.

Lifestyle Habits

Some lifestyle habits including drug abuse, smoking and alcohol intake during pregnancy also result in pregnancy loss. They can lead to miscarriage either early or in the later trimesters as well. Leading a healthy lifestyle will help reduce the risk. Most of the women do not actually realize that they are pregnant even after missing their period and sometimes continue unhealthy lifestyle putting themselves more at risk. Limiting stress, preparing for the pregnancy by making changes to their diet and exercise and start taking prenatal vitamins is ideal to carry the pregnancy to term.

Thyroid Problems

Whether it is hyperthyroidism or hypothyroidism, thyroid disorders lead to infertility, birth defects and miscarriages. Women with high or low function of thyroid produce more hormones to compensate the changes in their body which will further supress ovulation. These hormones in turn interfere with the ability of oestrogen thus making the uterus unfavourable for implantation which results in uterine bleeding and miscarriage.


Women having diabetes are at an increased risk of miscarriage and need to consult their endocrinologist to control their sugar before they plan to get pregnant. Women who are more dependent on insulin are at a higher risk in the first trimester of their pregnancy and even have increased risk of birth defects. As conditions like hypertension, hyperthyroidism, diabetes and other autoimmune diseases increase the risk further, it is better to have a plan of action before getting pregnant.

Physical Complications and Blood Disorders

Cervical incompetency and uterine abnormalities are some of the less common but more significant miscarriage causes. Most of these physical complications occur in the 2nd and 3rd trimesters. Blood clotting disorders are also less common causes for miscarriage but do occur. However they are not as common as other reasons but still need to be considered and proper care taken to avoid miscarriage.

Role of Immunological Disorders

While it is still a mostly debated topic among healthcare providers, immunological disorders are said to contribute to miscarriage. Studies indicate that certain autoimmune disorders play a major role in miscarriages and can even lead to recurrent miscarriages. While the exact reason behind an autoimmune disorder affecting pregnancy is not yet known, experts believe that the body just doesn’t accept pregnancy during this condition.