Menstrual pad

Lore & Background

Menstrual pads have been mentioned as early as the 10th century in the Suda, referencing Hypatia of the 4th century AD who reportedly threw a used menstrual rag at an admirer. In ancient Egypt, women used softened papyrus. Before commercial products, most women used homemade cloth rags, giving rise to the euphemism 'on the rag.' The first widely recognized commercial menstrual pad was Johnson & Johnson's 'Lister's Towels,' introduced in 1896. Early disposables were cotton wool rectangles with extended ends that fit through loops in a belt, a design prone to slipping. Inventor Carolyn R. Mobley later patented an improved tab construction, building on earlier tab designs to enhance security and ease of use.

Reader's Guide

Menstrual pads are a fundamental hygiene product, used by billions over time. Their evolution from homemade cloth to disposable and reusable forms reflects changes in manufacturing, economics, and social attitudes. Disposable pads, now dominant in industrialized nations, contain non-biodegradable plastics and are rarely recycled, often ending up in landfills or incinerated. Reusable cloth pads, made from cotton, bamboo, or hemp, have seen a resurgence since the 1970s due to comfort, cost savings, and environmental concerns. Pads also serve in first aid as dressings for heavy bleeding. Despite their common use for urinary incontinence, they are less effective than purpose-made incontinence pads. The product's history shows a shift from discreet purchasing (placing money in a box) to open availability, and ongoing debates about material transparency and environmental impact.

Did You Know?

• Menstrual pads are not the same as incontinence pads, which generally have higher absorbency.
• Disposable pads often contain superabsorbent polymers that turn into a gel when moistened.
• Cloth menstrual pads made a comeback around the 1970s, with popularity increasing in the late 1980s and early 1990s.
• Menstrual pads should not be flushed down the toilet as they can cause blockages.

Design, Materials & Everyday Function

Menstrual pads are absorbent products worn on the inside of underwear to manage heavier menstrual flow. Constructed primarily from cellulose, they come in a range of absorbency levels and lengths to accommodate different flow volumes. Many feature wings and/or an adhesive backing to secure them in place against the body. They sit alongside pantyliners—smaller, thinner versions intended for lighter periods, intermittent bleeding, or vaginal discharge—and can also serve as a supplement to tampon use. Pads belong to the broader category of disposable feminine hygiene products, which also includes tampons and pantyliners. In contrast, reusable alternatives like cloth pads made from cotton, flannel, or terry cloth, as well as period panties and menstrual cups, offer washable options. The pad's design philosophy centers on external absorption: unlike tampons or cups that collect fluid internally, the pad catches flow at the surface, making it a straightforward, accessible choice for period management.

Health Risks & the Body's Natural Defenses

While menstrual products serve essential hygiene needs, they can interact with the body's delicate vaginal ecosystem. The vagina maintains its own defense system through normal flora, an acidic pH, and resident bacteria that produce antimicrobial compounds like bacteriocin, actively outcompeting pathogens such as E. coli and Group B Streptococcus. Disrupting this balance—whether through douching, which health professionals advise against, or through product-related irritation—can lead to issues like bacterial vaginosis, characterized by a uniform white or gray vaginal discharge, a fishy odor, and a pH above 4.5. Fragrances, neomycin in pad adhesives, tea tree oil, and benzocaine are all cited as potential irritants. Toxic shock syndrome, a rare but serious condition linked to bacterial toxins from Streptococcus pyogenes or Staphylococcus aureus, has been associated with prolonged tampon use. Additionally, some period underwear brands face class action lawsuits over PFAS exposure, raising concerns about long-term health outcomes including cancer risk.

Environmental Footprint & Sustainability

The cumulative environmental cost of disposable menstrual products is substantial. Over a lifetime, a menstruating woman in a developed country may use anywhere from 5,000 to 15,000 pads and tampons, generating approximately 400 pounds of packaging waste. Tampons, in particular, carry a heavier ecological burden because of non-biodegradable components such as plastic applicators and synthetic fibers. Menstrual pads, while made of cellulose, still contribute to this disposable waste stream. In response, reusable alternatives have gained traction as lower-impact options. The menstrual cup—crafted from silicone, natural rubber, or plastic—is widely regarded as the most environmentally friendly choice, as it can be emptied, washed or boiled, and reused repeatedly. Cloth pads made from cotton, flannel, or terry cloth, period panties, and menstrual sponges similarly reduce single-use waste. The menstrual disc, a medical-grade silicone product, extends this sustainability angle by collecting fluid for up to twelve hours and lasting over five years, positioning itself as both an eco-conscious and cost-effective period solution.

The Vulvovaginal Ecosystem & Product Interaction

The vulva serves as the body's first line of defense, shielding the genital tract from infection. However, the folds of the vulva can trap contaminants, and factors such as increased moisture, sweating, menstruation, and hormonal shifts can alter the growth and balance of microbial species, sometimes resulting in odor or vulvovaginal infections. Vulvar skin is distinct from other skin areas: it exhibits unique hydration levels, friction patterns, and permeability. The non-keratinized vulvar vestibule is likely more permeable than keratinized skin, making the area more susceptible to topical agents than, say, forearm skin. This heightened sensitivity has direct implications for how menstrual products—whether pads with adhesive backings, tampons, or cleansing products like douches and feminine wipes—interact with the tissue. The vagina's innate protection relies on resident bacteria maintaining an acidic environment and generating bacteriocin to neutralize threats. When products introduce foreign chemicals or disrupt microbial balance, the consequences can range from mild irritation to more serious conditions like yeast infections or bacterial vaginosis, where the natural bacterial equilibrium is lost and recurrence becomes difficult to prevent.