For men, the figure stands at one in five.
Almost two in every five women have put off seeing the doctor because they fear not being taken seriously.
That compares with one in five men, according to new research by Laya Healthcare.
Four in 10 women who did see a doctor felt their health concerns were misunderstood and believed that led to a delayed or incorrect diagnosis.
Portarlington GP Dr. Sumi Dunne says healthcare professionals need to improve how they approach issues affecting women:
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