Doctor says pillowcases need weekly washing: Many do it much less often

Pillowcases should be changed weekly to prevent the buildup of bacteria, according to Dr. Gareth Nye. He explains that sweat, skin flakes, and microorganisms accumulate on pillowcases, with women experiencing more sweat, especially during menopause.

Nye warns that changing pillowcases every two weeks, as many people do, is insufficient. After just one week of use, a square inch of pillowcase can harbor millions of bacterial colonies. This accumulation of sweat, oil, dead skin cells, and other debris can lead to skin irritation and acne, particularly for those with sensitive skin.

Experts recommend washing pillowcases along with regular laundry to ensure they remain clean and bacteria-free. Mattress expert Rebecca Swain notes that our faces are in contact with the pillow for about eight hours nightly. If the pillowcase isn't clean, it can cause skin issues. She also advises washing the pillows themselves once or twice a year to remove absorbed sweat and dirt. Swain adds that people with longer hair, washed infrequently, can further soil pillowcases with oily hair.