Across social media young women are discussing the "luteal uglies." These are changes in appearance and mood that women experience during the luteal phase of their menstrual cycle. We hear from women in Vietnam, the Philippines, and the UK about the symptoms they experience, from acne and bloating to fatigue and brain fog.
But what’s behind these changes? Dr Helen O'Neill, an associate professor in reproductive and molecular genetics at University College London, explains how changing hormone levels impact women’s bodies and their brains. She also offers some tips and coping strategies.
Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: William Lee Adams and Emma-Louise Amanshia Editors: Verity Wilde