It's something we all have in common and something we automatically do every single day.
But next time you empty your bladder, don't be too hasty to hit the flush. Instead, by having a quick check of what colour your wee is, you can learn valuable lessons about your health .
Changes in colour are normal and can even be caused by the food you're eating, but occasionally it can be a warning sign that there are serious problems going on.
Some have likened the toilet bowl to a 'crystal bowl' giving you insight into your body. We won't go that far, but below is a list of 10 colours you might possibly see in your loo and what they can tell you about yourself - according to urinecolors.com .
If your urine is clear, then it can signal that you're healthy. Typically, the lighter your urine, the healthier you are.
But as the 'ideal' healthy urine colour is straw yellow, clear wee might not be such a good thing.
While you could just have a very well-hydrated body, it could also mean that you are over -hydrated or could even be a sign of diabetes.
If you show symptoms of diabetes, such as increased thirst and frequent urination, then you should consult your doctor.
2. Pale yellow
This is what we're all aiming for. Healthy bodies produce urine that isn't too dark, which signals that you are well hydrated.
At the same time, you don't want it to be too clear - this points to a low concentration of waste in what you are passing.
If this were the case, you would have to go to the toilet more to excrete the waste your body doesn't need.
3. Bright yellow
Is your pee a good colour of yellow but is a bit, well, bright? You can blame B vitamins for this. Riboflavin (B2) is naturally fluorescent when exposed to UV light, so it can make your toilet bowl a bit of an alarming colour.
4. Dark yellow
This is typically a sign that you are not drinking enough water, and is at the darkest end of the "normal" spectrum.
If you don't hydrate yourself enough, then the waste products your body is getting rid of aren't diluted, causing a darker colour than is healthy.
The lesson to be learned from this? Increase your intake of water.
Light or dark brown urine can signify blood in the urine or a potential liver or kidney disorder.
It can also show that you've been overworking your muscles, which release a substance called myoglobin when damaged that can turn urine brown.
Urinary tract infections and liver disorders, such as cirrhosis, are other causes.
If you've had a green pint on St Paddy's Day, you will probably notice that the food colouring in the beer has turned your urine the same hue.
Asparagus can cause your wee to take on a greenish tint - but health issues can also do this
According to urinecolors.com: "Bile and diarrhea can cause a greenish tint to your urine, and pus from a urinary tract infection could also cause green urine."
If you don't present any of these symptoms, it's still probably to do with something you've ingested. But if you're concerned, always consult a healthcare provider.
Blue urine is mostly caused by foods or medications you've taken recently. Triamterene, Rinsapin and Viagra are all medications that can cause your wee to have a blue tinge - along with any other pills that use a blue dye.
Even if it looks like something out of Avatar, it's probably not going to be down to an ongoing health issue and is more likely to be due to something you've ingested.
As previously stated, dehydration can cause a darker urine colour that can sometimes appear orange.
Jaundice can also be a factor here, causing bile to show up in your wee that gives it an orange hue.
If this change in colour is food-related, then it will probably only last a day or two at most. If it lasts more than a couple of days, you should consult your doctor.
9. Pink or red
Unless you've been eating lots of beetroot, this could be a sign that you are passing blood when you go to the toilet.
Blood in your urine could be a sign of a urinary tract infection or urinary stones. These are usually accompanied by pain and discomfort, so you would probably notice other symptoms.
Kidney and bladder cancers can also cause blood in the urine and typically don't have any other symptoms associated - so if you find blood in your wee, you should let your doctor know.
If you've eaten a large amount of food or medicine which uses black colouring, you can probably safely assume that this is the cause.
But if you've ruled that out and think this is down to a health issue, then black urine is a serious warning sign.
If you're concerned about the colour of your urine, always consult your doctor.