Urinary tract infection

Tiny germs can get into your body.

These germs can travel into your bladder. This can make it hurt to pee.

You might feel a sting or a burn. Some people also feel hot with a fever. It can even make your tummy hurt.

Doctors can give you medicine to help. This medicine fights the germs. It helps you feel better soon.

A urinary tract infection is often called a UTI. It happens when germs get into the urinary tract. This system includes the bladder, the urethra, and the kidneys.

Most UTIs are caused by a germ called E. coli. These germs usually enter through the urethra. Once inside, they can stick to the bladder wall. They may even make a biofilm. A biofilm is a layer that helps germs stay put.

Symptoms can change depending on where the germs are. A lower UTI affects the bladder or urethra. This can cause pain or a burning feeling when peeing. You might also feel a strong urge to pee.

An upper UTI affects the kidneys. This is called pyelonephritis. It can cause fever or pain in the side. Sometimes, the urine may look bloody or contain pus.

Doctors treat most UTIs with antibiotics. These are medicines that kill germs. Some cases need a longer course of medicine. About 400 million cases happen every year. Many women get them, especially between ages 16 and 35.

A urinary tract infection, or UTI, is an infection in the body's plumbing. This system includes the kidneys, the bladder, and the urethra.

There are two main types of these infections. A lower UTI affects the bladder or the urethra. This is often called cystitis. An upper UTI affects the kidneys. Doctors call this pyelonephritis. These infections are very common around the world. About 400 million cases occur every single year.

Most infections happen when tiny germs enter the urinary tract. The most common germ is called E. coli. It usually travels from the bowel to the urethra.

Once the E. coli reaches the bladder, it sticks to the walls. It can even build a biofilm. A biofilm is a sticky layer that helps germs stay put. This layer helps them resist the body's natural defenses. Sometimes, germs can also enter the tract through the blood.

People have known about these infections for a very long time. The first written description is found in the Ebers Papyrus. This ancient document dates back to about 1550 BC.

Even in ancient times, people noticed these health issues. Today, we use much better tools to study them. We can look at urine under a microscope to find bacteria. This helps doctors see if there are white blood cells present. It also helps them see if there is blood in the urine.

Symptoms can change depending on who is sick. In healthy women, a UTI might cause burning or pain during urination. It can also cause a strong urge to pee.

In young children, a fever might be the only sign. Very old people might just feel tired or confused. For some, the urine might even look bloody or contain pus. About 10% of women will have an infection in a single year. They are most likely to get them between ages 16 and 35.

Doctors usually treat simple cases with antibiotics. These are medicines that fight the germs. Some people might need a longer course of medicine. Others may need medicine given through a tube in their vein. For people who get infections many times, doctors have other options. They might use a medicine called methenamine. Some women may also use estrogen to help protect them. It is important to follow a doctor's plan to get better.

A urinary tract infection, or UTI, is an infection that affects the body's urinary system. This system consists of the kidneys, the bladder, and the urethra, which is the tube that carries urine out of the body.

UTIs are extremely common, with approximately 400 million cases occurring every year. They are the most common bacterial infection found in women.

Understanding how these infections work is vital for medical care.

Medical professionals classify these infections based on where they occur. A lower urinary tract infection affects the bladder or the urethra. When the infection is specifically in the bladder, it is called cystitis. An upper urinary tract infection affects the kidneys. This specific type of kidney infection is known as pyelonephritis.

Some infections are also classified by their complexity. An uncomplicated UTI usually occurs in healthy, premenopausal women. A complicated UTI might involve a male patient, a pregnant woman, or someone with diabetes.

The mechanism of infection usually begins with bacteria entering the urinary tract. Most often, these bacteria travel from the bowel to the urethra.

The most common cause is a bacterium called uropathogenic Escherichia coli, or UPEC. Once UPEC reaches the bladder, it attaches itself to the bladder wall. The bacteria can then form a biofilm, which is a protective layer that helps them resist the body's immune response. While E. coli causes 75% of uncomplicated UTIs, other bacteria like Klebsiella pneumoniae can cause infections, especially in those using a catheter.

Symptoms of a UTI vary depending on the location and the person's age. Lower UTIs often cause burning or pain during urination. They can also cause pain in the lower abdomen or a frequent urge to urinate. Upper UTIs, or pyelonephritis, present more systemic symptoms. These include fever, nausea, vomiting, or flank pain in the side of the body. In rare cases, a person's urine may appear bloody or contain visible pus.

Children and the elderly often show different signs of infection. In very young children, a fever might be the only symptom. Infants may also feed poorly, vomit, or sleep more. About 1 in 400 infants with a UTI also have bacterial meningitis. In the elderly, symptoms are often vague. They might experience fatigue, incontinence, or a change in mental status, such as delirium. Some elderly patients may even present with sepsis, which is an infection of the blood.

History shows that humans have recognized these issues for millennia. The first documented description of a UTI is found in the Ebers Papyrus. This ancient Egyptian document dates back to approximately 1550 BC.

Since then, diagnostic methods have become much more precise. Doctors now use urinalysis to check for substances like nitrates or leukocyte esterase. They also use urine microscopy to look for red blood cells, white blood cells, or bacteria. A urine culture can confirm an infection if it shows a high count of bacterial colonies.

Treatment depends on the severity and type of the infection. Most uncomplicated cases are treated with a short course of antibiotics. However, resistance to many common antibiotics is currently increasing. Complicated cases might require longer courses or intravenous antibiotics delivered through a vein. For people with recurrent infections, doctors may prescribe methenamine. Postmenopausal women might also use vaginal estrogen replacement to help prevent infections. These treatments aim to clear the bacteria and protect the urinary tract from future issues.