Can stress affect teen periods: what we learned from 6,486 teens

Stress may affect teen periods. In a study of 6,486 teens in the U.S. who use Clue, those reporting high stress were more likely to track period cramps and heavy bleeding, and more likely to have short cycles (under 21 days). Researchers at the University of California, Berkeley, ran the study with Clue.

Ask anyone who was a teenager in 2020 and 2021, and they’ll probably tell you the same thing: it was a stressful time. Schools closed almost overnight, classes moved online, and time with friends was replaced by time on screens. 

Research has shown that anxiety and depression increased among young people during the COVID-19 pandemic (1). But one question received much less attention: Could all that stress affect teens’ periods?

Our research team at the University of California, Berkeley, working with Clue, set out to answer that question. Using survey responses and cycle data from more than 6,000 teenage Clue users in the U.S., we found that teens reporting higher stress were more likely to track period cramps and heavier bleeding, and more likely to have short menstrual cycles. The connection between pandemic-related stress and cramps was especially noticeable among teens who had started their periods more recently.

Can stress affect teen periods?

We know that stress can affect the menstrual cycle in adults (2,3). The body's stress response and the hormones that control the menstrual cycle are closely connected. Rising stress levels can interfere with the hormonal signals that help regulate the cycle.

But what about teens?

During the first few years after someone starts menstruating, their body is still developing the hormonal patterns that regulate the menstrual cycle (4). This means cycles are naturally more variable during this time and may be more sensitive to outside influences like stress.

Adolescence is also a time of significant physical, emotional, and social change, and many teens face considerable stress as they navigate these changes.

Despite this, relatively little research has explored the relationship between stress and menstrual cycles in teens, and no previous studies had specifically examined the stress experienced during the pandemic.

How we studied stress and teen periods

In spring 2021, we invited teens aged 13-18 in the U.S. who used Clue to take a short in-app survey. We asked how stressed they had felt over the previous month and whether the pandemic and stay-at-home restrictions had made their stress levels better or worse.

With their permission, we connected their survey responses to the period and symptom data they had already tracked in Clue.

The final dataset included 6,486 teens and nearly 39,000 menstrual cycles, tracked between June 2020 and June 2021. All participants had tracked at least six cycles in a row and reported that they weren't using hormonal birth control.

Because participants had recorded their periods as they happened, we could look at their tracking histories rather than relying on them to remember their cycles months later. That's one of the big advantages of using period tracking data for research.

How does stress affect periods? What the study found

First, stress was common. Almost 1 in 3 teens reported high stress levels, and 1 in 4 said the pandemic had made their stress a lot worse.

Compared with teens reporting low stress, those reporting high stress were:

• Slightly more likely to track period cramps

• More likely to track heavy bleeding

• More likely to have a short cycle (shorter than 21 days)

We saw a similar pattern among teens who said the pandemic had made their stress a lot worse: they were also more likely to track cramps and heavy bleeding.

The link between pandemic-related stress and period cramps was stronger among teens who had started their periods less than four years earlier. This suggests that menstrual cycles may be more sensitive to stress in the first few years of menstruation, while the hormonal systems that regulate the cycle are still developing.

We didn't find a link between stress and longer or more unpredictable cycles. One possible explanation is that teen cycles often vary from month to month, which could make additional changes harder to detect.

Why does this matter?

Your menstrual cycle can offer valuable clues about your overall health. In fact, healthcare providers increasingly recognize the cycle as an important vital sign, particularly during adolescence, when menstrual patterns are still developing and can offer early insights into reproductive health (5).

Our findings add to growing evidence that menstrual health doesn't exist in isolation. What's happening in our lives, including our stress levels, may also be reflected in our periods.

For teens, this matters in everyday life. Painful or heavy periods aren’t just a minor inconvenience. They can mean missed classes, skipped sports, and days spent feeling unwell. Understanding that stress may play a role helps validate these experiences and suggests that supporting teens’ mental health could also benefit their menstrual health.

For parents, schools, and healthcare providers, these findings are also a reminder to consider the bigger picture. A teen going through a stressful time may notice changes in their period, and changes in their period may also be a source of stress. As communities face future challenges, from pandemics to natural disasters, young people's mental and menstrual health deserves a place in the conversation.

Does stress cause painful or heavy periods?

Does this mean stress is responsible for every painful period or change in bleeding? Not at all.

Our study found a link between stress and certain menstrual cycle changes, but it can't tell us whether stress directly caused them. Painful or heavy periods can have many different causes, including conditions such as endometriosis.

It’s important to speak with a healthcare provider if your periods are very painful, unusually heavy, or suddenly different from what’s typical for you. 

Tracking can help. Recording your periods and bleeding flow, alongside symptoms like pain, can help you get to know what’s typical for your body and spot changes as they arise. That record can also be a useful starting point for a conversation with a healthcare provider.

The power of period tracking for research

This study also shows the broader impact of period and cycle tracking. At a time when in-person research was nearly impossible, thousands of teens were able to contribute to a better understanding of menstrual health by sharing the data they'd already tracked in Clue.

Thanks to everyone who participated in this study. By sharing your experiences, you've helped us uncover new insights into teen menstrual health and better understand how stress and periods may be connected. 

Research like this wouldn't be possible without you.

Find out more about scientific research at Clue.

Read the full study, “Stress and menstrual cycle characteristics among adolescents during the COVID-19 pandemic: An observational study using longitudinal app-tracking data,” in Women’s Health.