What Does It Mean When Your Toilet Seat Turns Blue?

You have probably just discovered it and are puzzled; why is my toilet seat turning blue? As perplexing as it may seem, toilet seats turning blue happens a lot, especially if your toilet is plastic.

While it may be a mystery to many, they are reasons why this discoloration occurs. 

Read on as we simplify the science behind a blue toilet seat. In this article, you will discover the blue toilet seat myths and the real reasons behind the color change. We will also explore various methods to remove the blue stains.

Why Is My Toilet Seat Turning Blue? The Myths

You’ve likely heard people say that a toilet seat turns blue as a sign of pregnancy.

Well, this is just one of the unusual color change suspects that are quite popular. Some of the common myths about blue toilet seats are:

A Toilet Seat Turning Blue Signifies Pregnancy.

All over the internet, there are reports of women coincidentally discovering their toilet seat blue at the same time as pregnancy.

They believe their changing hormones are the reason for the change, but no scientific study confirms this.

Furthermore, no one has conducted extensive research; most health experts consider it a myth.

After all, many reports on the blue toilet seats also come from people who aren’t pregnant, and men also notice it.

For an expectant woman, the likely culprit is probably the new blue skinny maternity jeans.

They will rub on the skin from constant wear, and the color transfer happens when you use the bathroom frequently. 

Unlike popular belief, it is not due to prenatal vitamins either. The ingredients in these supplements are specific to your body’s current condition.

They will not cause changes to your sweat’s color, especially not through the skin on your backside.

You May Have Cancer If Your Toilet Seat Turns Blue.

No way!! There is no medical evidence to prove that having cancer causes your toilet seat to turn blue. It is not a cancer symptom or a side effect of any cancer-related treatment or medication.

Although the excretory system of someone with cancer may change, these changes are unrelated to your toilet seat.

Most are early symptoms of the disease and will mostly affect one’s internal system, not your toilet seat.

Diabetes Can Turn A Toilet Seat Blue.

Show me the evidence! There’s absolutely no scientific information indicating that a blue toilet seat is due to diabetes.

I have scoured research journals both online and offline, and there is no medical report to prove that having diabetes can turn a toilet seat blue. For now, it remains speculation.

Why Is My Toilet Seat Turning Blue? The Facts

Now that we have ruled out pregnancy, cancer, or diabetes as reasons behind a blue toilet seat, let’s look at the actual causes.

Scientifically, the only practical reason behind the color change on your toilet seat is due to chemicals and their reactions.

Any substance that comes into contact with plastic especially cleaning materials or body fluids can cause discoloration.

Most households have plastic toilet seats, which are the common culprits. They absorb chemicals over time, and some substances may be corrosive hence the breakdown of the material.

Here’s a close look at why your toilet seat turns blue.

Clothing Dye

Dark blue clothing, especially jeans, tends to run, and the dye can transfer from our skin to the toilet seat.

Your blue pants likely stain your skin due to friction, and the color transfers when you use the toilet.

Check your skin for any dye stains every time you wear new jeans. If there aren’t any, they are not the reason for the blue toilet seat.

Toilet Cleaning Solutions

Most toilet cleaning substances have abrasive chemicals such as acid or bleach. Since these products kill stubborn stains and bacteria, they may cause toilet seat discoloration. Long-term use ends up producing the blue change.


As a rare condition, chromhidrosis turns one’s sweat to color, ranging from black, blue, and even yellow and brown.

While it is an unusual condition, it affects people of any age, and the sweat may stain your toilet seat.


If you take dye-based medication, you may excrete them in urine hence the blue stain on your toilet seat.

However, this is not permanent; you can easily wipe it off throughout your medication.

Body Fluids

Our bodies differ, and so do the sweat and urine we excrete. Sometimes, you may have chemical changes in your excretions, which discolor your toilet seat.

How Do I Get The Blue Off My Toilet Seat?

There are simple yet effective solutions to the question, why is my toilet seat turning blue? To get rid of the unsightly chemicals reaction shade, try the following:


Yes, bleach is a must-have cleaning product, especially to brighten white household surfaces like toilet seats.

If you notice the blue stain, mix one part bleach with one part water and pour it onto the surface.

Let it soak for a few minutes, then wipe it clean and dry off with a cloth or paper towel.

Vinegar and Baking Soda solution

As one of the safest natural stain removal remedies, vinegar, and baking soda is perfect for cleaning blue stains. First, pour one cup of white vinegar onto the toilet seat.

Next, sprinkle baking soda to produce a fizz. Please leave it to soak for a few minutes, gently scrub with a soft sponge, rinse, and dry it off.

Isopropyl Alcohol

Commonly called rubbing alcohol, it is a fast stain remover and will clean off the blue hue in under 30 minutes.

Dampen a soft cloth with the alcohol and spread it onto the toilet seat. After it has been resting for 20 minutes, remove the cloth and rinse off any blue residue left.


To answer the question, why is my toilet seat turning blue? We consider both myths and scientific facts as they are possible culprits.

Besides natural causes, chemical reactions from daily use and cleaning may bring on the blue hue.

Since plastic seats are the common culprits, use cleaning products sparingly and replace any with extensive discoloration.

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