A period is not only a monthly event to manage. It may also act as a warning light for health—and the warning can be shaped by money, education, caregiving, and everyday living conditions. Menstruation and the menstrual cycle are increasingly being considered vital signs for the health of women and people who menstruate.

Menstrual health includes access to accurate education, products, facilities and services, timely diagnosis, freedom from stigma and discrimination, and the ability to take part in daily life throughout the cycle. Menstrual inequity means systematic and avoidable differences in menstrual access and experiences between people and communities.

The study explores the connection between menstrual characteristics, social and demographic factors, and self-rated health. Understanding menstrual characteristics in context can highlight the needs of the most vulnerable populations. This matters because menstrual policymaking is increasing, but policies can fail when they do not respond to the needs of different groups of women and people who menstruate.

This was a cross-sectional study, part of the Equity and Menstrual Health in Spain project. It used a critical and feminist perspective to question androcentrism and systemic social and political inequalities that affect women and people who menstruate.

The study included a total of nineteen thousand three hundred fifty-eight women and people who menstruate in its analyses. It found that menstrual experiences varied widely, including differences in bleeding volume, blood clots, and how long menstruation lasted for participants.

Moderate or high-intensity menstrual pain was common, and premenstrual symptoms occurred in all or most cycles for many participants. The study considered menstrual patterns alongside social circumstances and health: financial constraints and poorer self-rated health were linked to several menstrual characteristics.

As age increased, lighter menstrual flow, fewer bleeding days, and shorter menstrual cycles were more likely. These patterns were also more likely among participants with less educational attainment. Caregivers had higher odds of abundant menstrual flow and longer menstruations.

Being a caregiver appeared to protect against experiencing premenstrual symptoms always or many times, and sometimes. By contrast, reporting financial difficulties and worsened self-rated health were linked with premenstrual symptoms. Self-rated health is widely used as a sign of general health status and health inequalities.

Poorer self-rated health was linked with higher odds of abundant bleeding, menstrual blood clots, short or long cycles, moderate or high-intensity pain, and premenstrual symptoms. These findings suggest a link between general health status and poorer menstrual health patterns, and they reinforce the connection between social inequalities and menstrual health.

The study included participants across the whole Spanish territory, but it was not representative of everyone living in Spain. The researchers note that people with limited digital access may be underrepresented, particularly among vulnerable and hard-to-reach populations in the study.

They also caution that retrospective self-reports rely on memory, meaning recall biases may affect the answers participants provide about their experiences. Estimating bleeding from the amount of menstrual products used may also be limited because people change products at different frequencies.

The study found that heavy bleeding, moderate or high-intensity pain, and premenstrual symptoms were more likely among participants with less educational attainment, more financial hardship, and poorer self-rated health. The findings suggest that menstrual health and menstrual management must take social inequalities into account.

For people seeking care, menstrual symptoms deserve attention as possible signs of health and living conditions, because symptoms were associated with financial hardship and poorer self-rated health. Healthcare professionals also need adequate training and support to address menstrual health while attending to social inequities affecting people's health.

In this Spanish study, poorer health and greater financial hardship were linked with several more difficult menstrual experiences. Menstrual care therefore needs to listen to people’s lives, not just their symptoms.