Periods: Everything You Need to Know is the go-to guide for modern tweens, teens and beyond about all things period.  From Dr Emily MacDonagh, practising NHS doctor and children's book author. Dr Emily takes on periods. This book won’t just focus on the week of your period – it will go into detail on what happens on each day of the cycle, how the hormones change across the month and how you can harness those hormones to work better for you. Every body is hormonal, and that is actually a good thing. In Periods: Everything You Need to Know, discover: What happens during each cycle Which days you might be feeling energised, and which days you might be feeling a little low What period products are on the market right now, and which ones are eco-friendly. Periods: Everything You Need to Know is your no-nonsense guide to all things period.