BACKGROUND: The second stage of labour is generally considered as an intensive part of labour. Despite this, knowledge about women's experiences of the second stage of labour is scant.

AIM: To explore experiences of the second stage of labour in women with spontaneous vaginal birth.

METHODS: This is a qualitative study where twenty-one women with a spontaneous birth at term, were interviewed four to ten weeks after birth. Data were analysed using qualitative thematic analysis based on descriptive phenomenology. The participating women had experienced a vaginal birth; some for the first time, having previously given birth by caesarean section and some with a previous vaginal birth.

FINDINGS: Three themes emerged: "An experience of upheaval" which represents the women's experiences of intensity, power and pain during the second stage of labour. "The importance of trusting relationships" signifies the meaning of women's relationships during the second stage of labour. "Becoming a mother" which is characterised by feelings of accomplishment and the experience of the final moments of birth.

CONCLUSION: During the second stage of labour women experienced overwhelming sensations which made evident the importance of trusting relationships with those involved in the birth. The women were in a transformative state between pregnancy and motherhood where experiences of being involved and being provided with information and guidance were all considered crucial. Continuous support should be offered to women during the second stage of labour.