A viral conversation has women comparing cycle changes, but experts say that there may be a simple explanation.

There is a strange little corner of the internet currently united by one question: “Has anyone else’s period gone completely rogue?”

From the UK to South Africa, India, the US and beyond, women are flooding social media with the same question: Why is my period suddenly doing its own thing?

While there is no evidence of a global menstrual event, thousands of online conversations have created a very real feeling of a collective experience.

Over the past few months, women have taken to social media, sharing that their cycles have been anything but predictable. Some say their period skipped a month entirely, while others say that they experienced what felt like a “double period” - bleeding twice within the same calendar month.