Severe nausea before and after pregnancy linked to depression, study finds

Women who experience severe nausea are more likely to have depression both before and after pregnancy and to receive an earlier diagnosis of depression after pregnancy, new research has found.

Hyperemesis gravidarum — severe, persistent nausea and vomiting that can stop normal eating and drinking — affects 0.3 to 3.6 per cent of pregnancies and is the most common cause of hospitalisation in the first trimester.

A nationwide Finnish study analysed register data from over 437,000 women (2004–2017), reporting the first bidirectional link between severe pregnancy nausea and depression.

The findings showed 8.8 per cent of those with severe pregnancy nausea had depression before pregnancy, compared with 1.0 per cent in the control group — more than five times the odds.

They were also about 3.5 times more likely to develop new, previously undiagnosed depression after childbirth, with 4.9 per cent diagnosed postpartum versus 1.0 per cent of controls.

Women with severe pregnancy nausea were diagnosed with depression earlier after delivery — averaging 3.3 years postpartum compared with 4.5 years in the control group.

The research suggests severe pregnancy nausea and depression may share biological mechanisms and highlights the need for systematic psychiatric screening during and after pregnancy, alongside multidisciplinary care.

Doctoral researcher Eeva Terävä-Utti from the University of Turku, said “Our research shows that severe nausea in pregnancy is not only a physically stressful condition, but also a significant mental health risk factor.

“The results emphasise the need for improved collaboration between psychiatry, gynaecology, and primary care.

“Our aim is also to raise awareness and improve access to support for these patients.”