News archive

The benefits of the HPV vaccine may extend beyond protection against cancer. In a study published in The BMJ, researchers at Karolinska Institutet found that women who had been vaccinated against HPV were less likely to experience several pregnancy and childbirth complications, particularly preterm birth.

Alberto Sola-Leyva, Assistant Professor at the Division of Obstetrics and Gynaecology, has been appointed Coordinator of the European Society of Human Reproduction and Embryology’s Special Interest Group Reproductive Genetics. The appointment covers the 2026–2028 term.

By using clinical studies, quality registers and AI, Sophia Brismar Wendel hopes to improve obstetric care. Meet one of the new professors of Karolinska Institutet who will participate in this year's installation ceremony at Aula Medica on 8 October.

Professor Ganesh Acharya of Karolinska Institutet has been honoured by the Baltic Fertility Society during the 8th von Baer Seminar, held on 11 September 2026 at Alatskivi Castle in Estonia. The recognition highlights his contributions to research, education and clinical development in fetal and maternal medicine.

Improving the quality of life for women is the aim of Helena Kopp Kallner’s work. Her research has already changed how women are treated across the world. Meet one of the new professors of Karolinska Institutet who will participate in this year's installation ceremony at Aula Medica on 8 October.

A combination of training, quality improvement and leadership support in hospitals across four countries in sub-Saharan Africa is linked to fewer stillbirths and deaths among newborns during the first 24 hours of life. This is shown by a study led by Karolinska Institutet and published in Nature Medicine.

Children whose mothers have congenital heart defects are more likely to experience difficulties in areas such as language, communication and social skills when they start school. This is according to a new study from Karolinska Institutet and the University of British Columbia, published in PLOS Medicine.

A pilot study from Karolinska Institutet shows that immunotherapy may enable stimulation of egg maturation in women with autoimmune POI (premature ovarian insufficiency) – a condition that usually leads to infertility. Three out of ten women gave birth to healthy babies following the treatment.

Fathers who take several months of parental leave have a lower risk of developing depressive symptoms during the early years of their child’s life than fathers who take only a short period of leave. This is shown by a new Swedish study involving researchers from Karolinska Institutet, published in the journal American Journal of Public Health.

Small abnormalities in blood sugar, blood lipids and inflammation several years before pregnancy are linked to an increased risk of high blood pressure during pregnancy and pre-eclampsia, according to a new study from Karolinska Institutet published in JAMA Network Open. The findings may contribute to earlier risk assessment and preventive measures in antenatal care.

Fathers in Sweden are less likely to receive a psychiatric diagnosis during their partner’s pregnancy and in the months following the birth of their child. However, diagnoses of depression and stress-related disorders increase a year later, according to a new study published in JAMA Network Open by researchers at Karolinska Institutet in Sweden and Sichuan University in China.

Pregnant women who use proton pump inhibitors, a common medicine for heartburn, run a slightly higher risk of developing infections during pregnancy and after childbirth. This is shown in a new registry study from Karolinska Institutet, published in the journal The Lancet Obstetrics, Gynaecology & Women’s Health.

The decision to have a child or not should belong to individuals, not to pollution in their environment, argues Pauliina Damdimopoulou, who studies how the chemicals in our environment affect the ovaries and the egg cells they contain. Meet one of the new professors of Karolinska Institutet who will participate in this year's installation ceremony at Aula Medica on 9 October.

Pregnant women with metabolic dysfunction-associated steatotic liver disease (MASLD) have an increased risk of giving birth prematurely and the risk increase cannot be explained by obesity, according to a new study from Karolinska Institutet published in the journal eClinicalMedicine.

The developing fetus is more susceptible to external influences than previously thought. A new study, published in Science Advances, shows that factors such as stress could affect the development of the fetal brain.

Women who have experienced pregnancy complications have an increased risk of cardiovascular disease. Now, a new study from Karolinska Institutet published in the European Heart Journal shows that sisters of women with complicated pregnancies are also at higher risk, even if they had uncomplicated pregnancies. The findings suggest that genes and shared environmental factors may influence the association between pregnancy complications and cardiovascular disease risk.

Women who suffer severe complications during their first pregnancy or delivery are less inclined to have more babies, a study published in JAMA by researchers at Karolinska Institutet reports. Given the recent steady decline in birth rate in Sweden, the researchers propose monitoring in antenatal care to address the problem.

Children whose mothers have taken antiseizure drugs during pregnancy are more likely than others to receive a neuropsychiatric diagnosis. This is according to a comprehensive study by researchers at Karolinska Institutet and elsewhere, published in Nature Communications. However, the researchers emphasise that the absolute risk is low.

Clinics and hospitals currently defer medication abortion until ultrasound confirms a pregnancy inside the uterus. However, a large international study led by researchers from Karolinska Institutet now indicates that treatment can be equally effective and safe even before the sixth week of pregnancy. The study is published in The New England Journal of Medicine.

Researchers at Karolinska Institutet have mapped how small RNA molecules, such as the recently Nobel Prize-awarded microRNAs, control cell development in the human embryo during the first days after fertilisation. The findings, published in Nature Communications, may eventually contribute to improved fertility treatment.

Heatwaves in sub-Saharan Africa are predicted to become more common due to climate change. A new study by researchers at Karolinska Institutet and others, published in Nature Medicine, reveals a worrying correlation between high temperatures in the final week of pregnancy and an increased risk of stillbirth and early neonatal mortality.

In first-time mothers requiring vacuum-assisted delivery, a lateral episiotomy (angled cut) in the tissue between the vaginal and anal opening more than halves the risk of obstetric anal sphincter injury, a severe form of perineal trauma between the vulva and anus. This according to a randomised clinical study led by researchers at Karolinska Institutet and Stockholm’s Danderyd Hospital, the results of which are published in The BMJ.

Angelique has a background in KI, where she obtained her medical degree, her path has been paved through many years of clinical service at Karolinska University Hospital and she is a specialist in both gynecology & obstetrics and gyneoncology.

In the largest epidemiologic study to date of the risk of giving birth to a child with autism, ADHD or intellectual disability following acetaminophen use during pregnancy, researchers found no association. The study is now published in JAMA.

Women with premenstrual syndrome (PMS) or premenstrual dysphoric disorder (PMDD) have a higher risk of perinatal depression. Conversely, women with perinatal depression have a higher risk of developing premenstrual disorders. This is shown in a study from Karolinska Institutet published in the journal PLOS Medicine.

A comprehensive registry study from Karolinska Institutet shows that children of women who suffer from post-traumatic stress disorder (PTSD) right before or during pregnancy are almost twice as likely to be diagnosed with ADHD later in life. The study is published in the journal European Psychiatry.

After the egg has been fertilized by a sperm, the surrounding egg coat tightens, mechanically preventing the entry of additional sperm and the ensuing death of the embryo. This is according to a new study led by researchers at Karolinska Institutet and published in the journal Cell. The work also explains how mutations in egg coat proteins can cause female infertility and may eventually lead to new contraceptive methods.

In recent years, the treatment landscape for solid tumors has undergone a notable change. With new cancer treatments, the future looks brighter for many young cancer patients, making fertility issues and future family planning an important aspect. Six specialists in oncology and onco-fertility at the Department of Oncology-Pathology join forces to compile knowledge and recommendations on this important issue.

Women who suffer depression during or after pregnancy have a higher risk of death by both natural and unnatural causes, a new study of childbirth in Sweden published in The BMJ reports. The increased risk peaks in the month after diagnosis but remains elevated for as long as 18 years afterwards.

Women with autoimmune disease are more likely to suffer from depression during pregnancy and after childbirth; conversely, women with a history of perinatal depression are at higher risk of developing autoimmune disease, a new study from Karolinska Institutet published in the journal Molecular Psychiatry reports.

Skin-to-skin contact between parent and child during the first hours after a very premature birth helps develop the child's social skills. This is according to a new study published in JAMA Network Open by researchers from Karolinska Institutet and others. The study also shows that fathers may play a more important role than previous research has shown.

KI-researcher Pauliina Damdimopoulou has been awarded a EUR 2 million ERC Consolidator Grant (European Research Council) for the SAFER project (SAfeguarding female FERtility-development of human-relevant in vitro tools for reproductive toxicity). The research will investigate the impact of commonly occurring environmental chemical contaminants on women's reproductive health. The grant is awarded under Horizon Europe, the EU's programme for research and innovation.

Children of a parent with alcohol or drug use disorder have a greater risk of intellectual disability, even if the problem only lies with the father, researchers from Karolinska Institutet report. According to the study, which is published in the journal eClinicalMedicine, preventive measures should be directed at both parents.

Infants whose mothers have used snus (a moist oral tobacco product) during pregnancy run three times the risk of sudden infant death, according to a comprehensive registry study from Karolinska Institutet published in the journal Pediatric Research. The risk was much lower if the mother had stopped taking snus before the first antenatal visit. The researchers conclude that all types of nicotine products should be avoided during pregnancy.

Dads are more likely to feel depressed when their kids are toddlers if their coparenting relationships are poor in the months after birth, a new study by researchers at Karolinska Institutet in Sweden shows. The findings are published in the Journal of Affective Disorders.

Nataliia Petryk ran a private clinic in Kyiv helping women give birth when she was forced to flee Ukraine when Russia invaded her country. By following a call by the European Research Council for EU teams to take in Ukrainian scientists, she is now able to conduct research to prevent miscarriage at Karolinska Institutet. Her experience is an example of how science knows no borders.

The risk of complications in assisted reproduction is higher when two embryos are transferred, instead of one embryo. This has been shown in a study published in the journal JAMA Pediatrics, which included all births in Sweden 2007-2017.

Researchers from KTH Royal Institute of Technology (KTH) and Karolinska Institutet are part of a collaborative study that has made progress in the testing of an innovative contraceptive method, a vaginal gel, that preclinical studies have shown prevents sperm from reaching the egg. The results are described in a paper published in the journal Science Translational Medicine.

An observational study at Karolinska Institutet shows that babies suffering oxygen-deficiency complications at birth are almost twice as likely to develop cardiovascular disease during childhood and early adulthood as those without such complications. Still, the absolute risk of cardiovascular disease is very low in young age. The findings are published in the journal The Lancet Regional Health – Europe.

Infections in pregnant women have been linked to an increased risk of neurodevelopmental conditions, such as autism, in the child later in life. But it does not seem to be the infections themselves that cause autism, researchers from Karolinska Institutet show in a study published in The Lancet Psychiatry.

A new study published in The Lancet shows that medical abortion can be carried out both safely and effectively via telemedicine, without a routine ultrasound examination. The study, which is a collaboration between researchers at Karolinska Institutet and the University of Cape Town in South Africa, highlights the opportunities to provide safe and effective abortion services in low-resource settings.

Women with a breast cancer diagnosis undergoing procedures for fertility preservation are not at increased risk of recurrence of the disease or disease-specific mortality. This has been shown in a study by Karolinska Institutet that followed the participants for five years on average. The results, published in the journal JAMA Oncology, could in the future provide safety and new hope to women who want to preserve their fertility after cancer treatment with chemotherapy.

Researchers at Karolinska Institutet and the University of Bristol have investigated the relationship between mode of delivery and sexual well-being several years after childbirth. The study, published in the journal BJOG, showed no difference in sexual frequency or sexual satisfaction in women who were delivered vaginally or by caesarean section.

To track and analyze caesarean section trends and thus improve maternity care, the Robson classification is used worldwide. A study from Karolinska Institutet in Sweden shows differences between Sweden and Canada, and that the classification system can be further developed to take into account more important variables. The study, published in PLOS Medicine, may contribute to improved and more equal maternity care in the future.

Vaccination against COVID-19 during pregnancy is not associated with a higher risk of pregnancy complications, according to a large-scale registry study from Karolinska Institutet in Sweden and the Norwegian Institute of Public Health published in the journal JAMA.

Women who have had one ovary surgically removed (unilateral oophorectomy) are less likely to become pregnant after in vitro fertilisation and give birth to fewer babies than women with both ovaries. That is according to an extensive meta-analysis published in the journal Fertility and Sterility by researchers at Karolinska Institutet.

When she was 14 years old Jessica Strid was treated for cancer and was told that it would be difficult for her to get pregnant. Today she has two children. ”I am very grateful”, she says.

Many young people whose fertility have been impaired due to cancer treatment can today be helped to become parents. Kenny Rodriguez-Wallberg, Adjunct Professor at the Department of Oncology and Pathology at Karolinska Institutet and Senior Consultant at Karolinska University Hospital, answers six common questions.

According to the WHO, almost 50 million couples worldwide are involuntarily childless while demand for assisted fertilisation is expected to grow as treatments have become both more effective and more widely accessible. Read the first article from a in-depth series about infertility from KI’s Swedish popular science magazine.

The treatment of serious prodromal cervical cancer, CIN3, can cause problems during later pregnancy amongst women of fertile age. A new registry study from Karolinska Institutet shows a higher risk of several adverse pregnancy outcomes after such treatment, but the risks have declined over time and the increased risk of infant death no longer exists. The study, which included a large number of births in Sweden over a 46-year period, is published in The Annals of Internal Medicine.