Redefining menstrual and reproductive health, one period at a time.
Subscribe to our newsletter to get science-backed articles, app tips, and the latest updates from Clue.
Featured
LGBTQIA+
The science behind periods and gender
Trans inclusion does not exclude women. We are here to explain why.
by Sarah Toler, DNP, Science Writer for Clue
Most Popular
Pregnancy, Birth & Postpartum
Motherhood is complicated
What does it mean to be a mom? Well, it’s complicated.
by Sarah Toler, DNP, Science Writer for Clue
Gender Equality
Why are women and people with cycles underrepresented in health research?
The consequences have been dangerous.
by Ijeoma Unachukwu, M.S., Guest Writer
Race
The racist and unethical origins of modern gynecology
How the past affects present day obstetrics
by Annabel Sowemimo, MBBS, Msc, DFRH DTMH, Guest Writer
COVID-19
How coronavirus impacts pregnancy, breastfeeding, and postpartum
Science is evolving each day on how coronavirus affects pregnancy, lactation, and postpartum. Here’s the latest research on how pregnant...
by Sarah Toler, DNP, Science Writer for Clue
Pleasure
Anal sex 101
History, anatomy and recommendations for a safe and pleasant practice
by María Fernanda Ojeda, Colaboradora
About Clue
Clue Plus: get the most out of your Clue app
When you subscribe to Clue Plus, you don't only get new features: you also fund important research, support data privacy,...
Browse articles by categories
Menstrual Cycle
Everything you need to know about your cycle and how it works, from A to Z.
Go to topic page
Menstrual Cycle
What is an “irregular” menstrual cycle?
Some variability in your cycle length is normal.
by Anna Druet, Former Science and Education Manager
Menstrual Cycle
The menstrual cycle: more than just your period
Understanding the cycle is important for your overall health. We break down the phases and hormones of the menstrual cycle.
by Laurie Ray, DNP, Science Writer at Clue
Menstrual Cycle
Top menstrual cycle symptoms: Clue survey results
by Dr. Marija Vlajić Wheeler, Former Data Scientist; Daniel Thomas, Head of Data Science at Clue; and Adeline Lee Chai Suan, Former Product Manager at Clue
Birth Control
Birth control and sex drive
Whether you’re using birth control or not, you can use Clue to track both your sexual frequency and sex drive.
by Maegan Boutot, Former Science Writer for Clue
Birth Control
Emergency contraception: when it’s most effective
There is a lot of confusion around the use and effectiveness of emergency contraception.
by Anna Druet, Former Science and Education Manager
Birth Control
Birth control and weight gain
Many people believe that hormonal birth control causes weight gain, but the research is not so clear cut. Here's how...
by Laurie Ray, DNP, Science Writer at Clue
Birth Control
How effective is birth control?: The difference between using a method perfectly and typically
Researchers measure how well a birth control method works in two ways: perfect-use and typical-use.
by Maegan Boutot, Former Science Writer for Clue
Birth Control
How to track your body's changes when going on or off birth control
If you’ve ever started or stopped taking hormonal birth control, your body may have experienced side effects. Tracking changes in...
by Stephanie Liao, Former Copy Manager
Birth Control
Bleeding on the IUD
IUDs can have different effects on your period quality and quantity.
by Nicole Telfer, Former Science Content Producer
Birth Control
My IUD insertion: a kind-of boring story
When it works out just fine, we don't often hear about it.
by Amanda Cormier, Former Head of Content
Birth Control
How do IUDs prevent pregnancy?
What the latest research says about how the hormonal IUD and the copper IUD work.
by Sarah Toler, DNP, Science Writer for Clue
Birth Control
What it’s like to use the morning-after pill
We reached out seeking your experiences with the emergency contraceptive pill. Here’s what came in.
by Jen Bell, Former Writer at Clue
Birth Control
IUD myths and misconceptions
Is it painful to have an IUD inserted? Can an IUD get lost inside of me? Your questions about...
by Laurie Ray, DNP, Science Writer at Clue
Fertility
Ovulation: What is it, and how do I know when I'm ovulating?
It is helpful to know about ovulation even if you aren't trying to get pregnant.
by Anna Druet, Former Science and Education Manager
Fertility
What you may not know about ovulation: common questions and misconceptions
The monthly release of an egg from the ovary is a fascinating process.
by Nicole Telfer, Former Science Content Producer
Fertility
Can you get pregnant from that?
There are lots of myths and misconceptions about how pregnancy happens.
by Jen Bell, Former Writer at Clue
Fertility
Basal Body Temperature (BBT): How is it used to estimate ovulation?
Your reproductive hormones have a measurable impact on your temperature.
by Science Writers at Clue, Science Team
Fertility
Sperm and eggs: the basics of human sex cells
How many eggs do I have? How many sperm are in an ejaculate? And more answers to your questions
by Clár McWeeney, Former Content Manager at Clue; and Nicole Telfer, Former Science Content Producer
Fertility
Pregnancy tests: when and how to take a pregnancy test
by Clár McWeeney, Former Content Manager at Clue
Issues & Conditions
Menstruating while disabled
Women and people with cycles can face barriers to adequate healthcare, and having a disability can add another layer of...
by Clár McWeeney, Former Content Manager at Clue
Issues & Conditions
Become your own health advocate: Ask your OB/GYN for these 4 tests
by Erica Avey, Former Writer at Clue
Issues & Conditions
The immune system and the menstrual cycle
During the follicular phase of the menstrual cycle, people tend to have higher levels of antibodies.
by Maegan Boutot, Former Science Writer for Clue
Issues & Conditions
Yeast infection 101: Symptoms & Treatment
by Laurie Ray, DNP, Science Writer at Clue
Issues & Conditions
Toxic Shock Syndrome (TSS) and menstrual products: a short history
You may have heard about TSS, and know that it has something to do with tampons. Fortunately, it’s rare.
by Maegan Boutot, Former Science Writer for Clue
Issues & Conditions
Hyperthyroidism and the menstrual cycle
by Nicole Telfer, Former Science Content Producer
Issues & Conditions
Hypothyroidism and the menstrual cycle
by Nicole Telfer, Former Science Content Producer
Issues & Conditions
Hyperprolactinemia and the menstrual cycle
by Maegan Boutot, Former Science Writer for Clue
Issues & Conditions
Anorexia and the menstrual cycle
by Nicole Telfer, Former Science Content Producer
Issues & Conditions
Zika virus: What you need to know
by Anna Druet, Former Science and Education Manager
Sex
Sex is an important part of the human experience. It can still be taboo to talk about, but here you'll...
Go to topic page
Sex
Period sex 101
There is nothing “dirty” or dangerous about menstrual blood.
by Clár McWeeney, Former Content Manager at Clue
Sex
Condom use from a female perspective: Clue’s study with KI-CURT
Clue polled 95,000 people from 200 countries on condom use and menstruation
Sex
A beginner's guide to sex
All the basics on sex, STIs, condoms and more.
by Stephanie Liao, Former Copy Manager
Life & Culture
Internationally inclusive: keeping Clue gender-neutral in 15 languages
Gender-inclusivity is an important part of what we do at Clue. We asked our translators: “What does it mean to...
by Jen Bell, Former Writer at Clue
Life & Culture
How to advocate for yourself at the doctor
Here’s what to do before, during and after your visit, to get the best healthcare possible.
by Jen Bell, Former Writer at Clue
Life & Culture
Let’s lose “virginity,” once and for all
by Jennifer Neal, Former Content and Social Media Manager at Clue
Track your period and understand your body better. Get the app:
App Store
Play StoreAbout Clue
Clue is a menstrual tracking app, an encyclopedia, a resource for your health, and more. Here are all the posts...
Go to topic page
About Clue
“Alternative” approaches to health: How we think about health information at Clue
We sometimes get emails asking why we collaborate with naturopaths for our online content. It's a fair question.
About Clue
The journey of a single data point
It's our job to keep everything you track in Clue safe.
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
Why we’re proud to work at Clue
For this Pride month, we wanted to take a moment to reflect on why some of our employees are proud...
About Clue
A global call for action on the International Day of Action for Women’s Health
We’re joining the UN’s Generation Equality initiative to contribute to the global effort for gender equality.
About Clue
Scientific research at Clue
When you track in Clue, you contribute to an unprecedented data set that is forwarding the understanding of female health.
by Anna Druet, Former Science and Education Manager
About Clue
Bringing awareness to infertility: how tracking your period can help
In recognition of #NIAW2021, and the people with periods and their partners who experience infertility, we hosted a webinar with...
by Lynae Brayboy, MD, Chief Medical Officer at Clue
About Clue
The rise of a new category: Femtech
In 2009, I sat with an old phone in my hand — the kind with a small screen and actual buttons
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
5 unexpected benefits of period tracking
Clue co-founder Ida Tin shares her top 5 reasons to track your period.
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
Clue report: Reproductive health in 2017
by Anna Druet, Former Science and Education Manager
About Clue
10 health facts Clue learned in 2018
Impress your friends and family with these menstrual and reproductive health facts.
About Clue
“The Clue app saved my life”: Early detection through cycle tracking
by Erica Avey, Former Writer at Clue
About Clue
Choosing to challenge: New leadership–same powerful vision
I am proud to announce that Carrie Walter, formerly Clue’s General Counsel, and Audrey Tsang, formerly Clue’s Chief Product Officer,...
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
Diversity, equity and inclusion at the heart of Clue
Diversity, equity and inclusion are not end states. Like all real values, they are living concepts to which we must...
by Carrie Walter, Co-CEO at Clue
About Clue
Clue Plus: get the most out of your Clue app
When you subscribe to Clue Plus, you don't only get new features: you also fund important research, support data privacy,...
About Clue
How we think about birth control at Clue
It’s a tricky topic.
by Amanda Cormier, Former Head of Content
About Clue
Here's why you can use period trackers for getting pregnant, but not for preventing it
While you can use Clue and other apps to help you understand your body and become pregnant faster, you can’t...
by Stephanie Liao, Former Copy Manager
About Clue
What's this? Bayer Sponsored Content
Information about content produced by Clue and sponsored by Bayer.
by Amanda Cormier, Former Head of Content
About Clue
Why does it cost so much to build an app, and who pays?
We don't make money from selling your personal health data—we choose the alternative. You can help support us by subscribing...
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
Introducing Clue’s first-ever Chief Medical Officer, Dr. Lynae Brayboy
Clue's new Chief Medical Officer will help Clue evolve into the go-to source for women and people with cycles at...
by Aubrey Bryan, Content Editor at Clue
About Clue
The ways apps make money and spend money
Getting an app like Clue up and running is no small feat. Clue's CEO Ida Tin explains what's going on...
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
Making money at Clue: our principles and promises
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
The journey of a single data point, Part III: About the selling of health data
We never have and we never will.
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
The journey of a single data point, Part II: The underworld of digital advertising
How Clue and other companies use your data to find new users.
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
Why we made a website
People deserve a different kind of online resource: a place where menstrual and reproductive health is taken seriously and with...
by Amanda Cormier, Former Head of Content
About Clue
Ida Tin’s presentation at Stanford University
by Ida Tin, Co-founder and Chairwoman of Clue
About Clue
Pushing menstrual and reproductive health forward
by Shari Mahrdt, Former Video Producer at Clue
About Clue
Clue’s Editorial Policy
At Clue, we prize openness and transparency—that’s why we’re publishing information about how and why we publish content.
About Clue
Accessibility guide to the Clue office
Everything you need to know if you’re visiting us in Berlin.
by Jen Bell, Former Writer at Clue
About Clue
Clue and UNFPA Brazil sign partnership on reproductive and sexual health
Clue is the only period tracker and menstrual calendar app signatory of the Alliance for Sexual and Reproductive Health and...