When you first get a pillow, it’s bright white and fluffy. But after just a few months of use, it can start to take on a yellowish tint that looks less than hygienic. Is it just dirt, wear and tear, or something else?

The answer is simple: that yellowing is caused by a buildup of sweat, body oils, saliva, and skincare product residue. Even if you change your pillowcase regularly, these substances gradually seep through and discolor the pillow itself.

Let’s take a closer look at the main causes of pillow yellowing.

The Main Causes of Yellow Stains on Pillows

Nighttime Sweating
Your body naturally sweats during the night—even if you don’t notice it. On average, a person can lose between 500 and 700 ml of sweat per night. That moisture gets absorbed into fabrics and, over time, leaves yellow stains.

Body Oils
Your skin constantly produces natural oils that transfer to your bedding. Unlike sweat, these oils are greasy and harder to remove. Over time, they soak into your pillow and contribute to yellowing.

Saliva
If you tend to drool while sleeping, it can also speed up discoloration. Saliva contains enzymes that, when absorbed into fabric, can change its color.

Skincare Products and Makeup
Night creams, serums, and other skincare products applied before bed can also stain your pillow. Even after washing your face, residue may linger on your skin and transfer to the fabric overnight.

How to Prevent Your Pillows From Turning Yellow

Fortunately, there are several easy tips to help prevent stains and keep your pillows fresh for longer.

Use a Protective Pillow Cover
A waterproof or breathable pillow protector acts as a barrier between your pillow and sweat or oils. These covers are machine washable and much easier to clean than the pillow itself.

Change Your Pillowcase Frequently
Wash your pillowcases at least once a week to prevent the buildup of oils and dirt. Use a hot wash cycle (around 140°F or 60°C) to kill bacteria and remove residue effectively.