If a person is dehydrated their pee may appear foamy. This is because they are not drinking enough water.
Foamy pee is not something you expect to see, but it is not that uncommon.
You might assume there was residual bleach left in the toilet, but actually it's your urine that's created the bubbles.
However, if you consistently happening, it may be a sign of these problems so you may need to see a doctor.
If a person is dehydrated their wee may appear foamy. This is because they are not drinking enough water, so the body is only getting rid of very concentrated amounts of waste. Dehydration occurs when you lose more fluid than you are taking in.
The pee may also be dark yellow and smell bad, you may feel dizzy, tired and feel very thirsty.
It's vital you drink enough each day to keep your pee a pale straw colour.
If left untreated dehydration can lead to serious complications including kidney failure, heart problems, shock and even a coma.
If there is a lot of sugar in your pee, like if you have diabetes, it may be foamy.
Someone with uncontrolled diabetes - think if you haven't been diagnosed yet - is more likely to have higher levels of sugar in the wee.
If your blood sugar levels get too high your kidneys may have trouble processing waste properly, so there will be more sugar and proteins in your wee.
If you have diabetes you may also experience a dry mouth, blurred vision, a frequent need to pee, hunger, itchy skin and fatigue.
The most worrying thing foamy urine could indicate is that it could be kidney disease.
Part of the kidneys job is to filter proteins in the blood. These proteins play a role in how the body functions, but when a person has kidney damage the proteins can be expelled from the body through wee. When this happens it's called proteinuria, or protein in the wee which can cause the pee to foam.
Proteinuria may also cause itchy skin, nausea, shortness of breath, swelling, fatigue, a frequent need to wee and vomiting.