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
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, CEO of Clue
Most Popular
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, CEO of Clue
COVID-19
Will coronavirus impact access to contraception?
The coronavirus pandemic might impact how you can access birth control. Here’s the latest information on contraceptive access during coronavirus...
by Sarah Toler, DNP, Science Writer for Clue
Hormonal Birth Control
How every method of hormonal contraception affects your period
All hormonal contraceptives are associated with changes in menstrual bleeding patterns. Here’s the latest research on how every method of...
by Kate Wahl, Science writer for Clue
LGBT+ Voices
The best things about dating someone who also has a period
There are many stereotypes about romance between two people with menstrual cycles. We reached out to lesbians, transgender and queer...
by Jen Bell, Former Writer at Clue
Hormonal Birth Control
Here are all of your hormonal birth control options
We looked into the research to find out about the side effects, risks, and benefits of the implant, the intrauterine...
by Sarah Toler, DNP, Science Writer for Clue
Browse articles by categories
Menstrual Cycle
Everything you need to know about your body 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
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
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
Birth Control
For now, the Clue app is not a contraceptive. Here’s why.
If avoiding pregnancy is important to you, then you shouldn’t use Clue as a form of birth control.
by Anna Druet, Former Science and Education Manager
Birth Control
Bleeding on the IUD
IUDs can have different effects on your period quality and quantity.
by Nicole Telfer, 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
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
Emergency contraception: when it’s most effective
by Anna Druet, Former Science and Education Manager
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
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, Copy Manager
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
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
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
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
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
Basal Body Temperature (BBT): How is it used to estimate ovulation?
Your reproductive hormones have a measurable impact on your temperature.
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, Science Content Producer
Fertility
Pregnancy tests: when and how to take a pregnancy test
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, Science Content Producer
Issues & Conditions
Hypothyroidism and the menstrual cycle
by Nicole Telfer, Science Content Producer
Issues & Conditions
Hyperprolactinemia and the menstrual cycle
by Maegan Boutot, Former Science Writer for 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
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
What sex education is missing
If we're lucky to even get sex education, there’s just still so much we aren’t taught about our own bodies.
by Shari Mahrdt, Former Video Producer at Clue
Sex
How to make sex education more inclusive
Sex education can help us make decisions, but only when taught in a way that is relevant to our individual...
by Jen Bell, Former Writer at Clue
Sex
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, Science Content Producer
LGBTQIA & Gender
Sharing LGBTQIA experiences with menstrual, reproductive, and sexual health through research-based advice, first-person perspectives, and more.
Go to topic page
LGBTQIA & Gender
Do periods sync?
Lesbian, queer and trans couples respond to our research on menstrual syncing
by Jen Bell, Former Writer 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
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
“The Clue app saved my life”: Early detection through cycle tracking
by Erica Avey, Former Writer at Clue
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, 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, CEO 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, Copy & Content Working Student
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, CEO of Clue
About Clue
The journey of a single data point
It's our job to keep everything you track in Clue safe.
by Ida Tin, CEO 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, CEO 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, CEO 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
Pushing menstrual and reproductive health forward
by Shari Mahrdt, Former Video Producer at Clue
About Clue
What you need to know about Clue’s Forecast feature
Clue already predicts your period, ovulation, and PMS, but what if you could see into the future for everything...
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...