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The smell of fresh urine is usually rather neutral if you drink enough (usually about one and a half to two litres a day) and empty the bladder at regular intervals. But sometimes even fresh urine can have a strong smell, and there can be several reasons for this.
In the past, urine was used to diagnose diseases and provide clues as to whether something was wrong in the body. Today, along with the colour and symptoms, the smell in urine can help indicate either good health or illness. The smell can be described in many different ways; for example, that it smells sweet, or that it smells like fish, ammonia or alcohol.
There could be various reasons why the urine smells unpleasant and more intense. Below are some examples of what could cause a strong smell in urine.
The smell in urine is strongly linked to what we eat. Asparagus is perhaps the most known food for giving urine a distinctly strong odour, due to the sulphurous metabolites that are excreted as it passes through the body.
Spicy food, such as curries, can also give urine a stronger smell. While coffee, garlic and brussels sprouts will all give urine a more distinctive odour, as they are broken down by the body when digested.
Medicines like penicillin can also affect the way urine smells, as some ingredients that go into this antibiotic are derived from mould, which can give urine a yeast-like smell. However, this is all completely harmless and should not persist once the course of medication is over.
Vitamin B supplements may also contribute to strong smelling urine, which may smell slightly musty. However this is not a cause for concern, and should abate if you lower your daily dosage to 10mgs or less.
When you don’t drink enough water, urine becomes more concentrated – this is reflected in its colour and smell. If urine is dark in colour with a strong smell, this can indicate dehydration.
Highly concentrated urine, caused by low fluid intake, is often strong-smelling. When urine is too concentrated, it also irritates the bladder lining. This can cause urge symptoms, which are characterized by a frequent need to go to the toilet.
Conditions that can lead to dehydration include fever, kidney disease, diarrhoea or vomiting. Anyone can become dehydrated, but some people are more at risk, e.g. small children, the elderly or people with a chronic disease or illness. If you suspect dehydration, in yourself or in others, it’s important to act. Always make sure you, or those you care for, get enough fluids.
Strong smelling urine that is dark and cloudy can be confused with symptoms of a urinary tract infection or so-called Asymptomatic Bacteriuria (see below).
Scientists have recently found that the urinary tract has its own microflora. This means that most people have small amounts of bacteria in their urine. However, this is quite normal and doesn’t cause any discomfort. Research is ongoing to find out the composition of this flora, whether it is stable or not and whether it can help prevent infections caused by other unwanted bacteria.
Sometimes, unwanted bacteria can enter the urinary tract and cause an infection – urinary tract infection or cystitis. This is often caused by the Escherichia coli bacteria that occur naturally in the intestine, and which sometimes get into the urethra and travel up the urinary tract. In women, a urinary or bladder infection occurs more often because the urethra is shorter and closer to the anus. In addition to bacteria, viruses or fungi can trigger an infection. The invading bacteria thrive in urine and multiply quickly and cause an infection, which can result in an unpleasant smell.
Symptoms of a urinary tract infection or cystitis can include:
It is also possible that large numbers of bacteria can populate the urinary tract. The bacteria are usually of different types and not especially harmful. This means they can be present without causing any problems, apart from making the urine smell unpleasant. This condition is known as Asymptomatic Bacteriuria (ASB) or ‘friendly’ bacteria. These bacteria are more common in the elderly, in women and in people with diabetes or catheters. This condition is not usually treated with antibiotics. This is because if the balance of flora is altered, antibiotic treatment may allow other bacteria to flourish that are more difficult to deal with.
For people with diabetes and a blood glucose level that is too high, the kidneys pass excess sugar out through the urine. This makes the urine smell sweet. Other symptoms of high blood sugar are feeling very thirsty and urinating frequently. If you have symptoms of high blood sugar, you should contact your doctor.
If urine smells bad, it doesn’t necessarily mean that something is wrong. However, if the smell in urine lasts for a long time and cannot be traced back to certain foods or medicines, and you are worried about symptoms, the cause should be investigated. If the colour of the urine has changed, if there is a pain when urinating or even blood in the urine, then a more thorough diagnosis is required. If you are concerned, you should contact your doctor.
If there is an unpleasant smell from the genitals, this could for example be caused by a bacterial imbalance. Reasons for this could be excessive hygiene, antibiotic treatment or using harsh soaps.
Healthy skin is more resistant to infection. So, it’s essential to keep the genital area clean and healthy to maintain or improve the skin’s ability to protect itself against infection. To avoid unpleasant odours, you should not only think of how to avoid a urinary tract infection but also include a good skincare regime, e.g. using skincare products specifically designed for intimate care that keep the skin in good condition.
To sum it up: When the smell in urine changes, it can be an important indicator of many things. The cause can be harmless, such as a large portion of asparagus for lunch. But it could also be dehydration or infection that causes the urine to have an unusual smell.
An attentive nose, together with a keen eye for other symptoms, can provide valuable hints – and if necessary, lead to a request for a medical diagnosis. There are also many helpful TENA incontinence products, for both men and women available to help keep the skin dry and prevent urine odour, as well as TENA skincare products to clean, moisturise and protect the sensitive skin in the perineal area. We have skincare products for men and for women.