According to the study, published in The Journal of Clinical Endocrinology and Metabolism, the risk of miscarriages increases in some women with low steroid levels, though the researchers added that giving steroids to such women may worsen the problem.
The researchers conducted a number of tests which revealed that low steroid levels often lead to the womb rejecting an embryo and damaging the way it nourishes a fetus that does implant.
"It causes incredible psychological distress and anguish. The routine advice in the UK is if blood tests identify no cause then there's no treatment, that's terribly unacceptable to patients. This work is really exciting because after years of controversy and doubt, we have a crucial breakthrough. It is really important women do not go out and take steroids, they might be in the category when it will do more harm", lead researcher Prof Siobhan Quenby said.