The kidneys are a vital organ that plays a crucial role in the body. The most critical function of the kidney is to filter waste products from the blood and regulate blood temperature. If these functions are compromised, you can become severely ill.
But that’s just the start. The kidneys are part of the body’s natural drainage system—the urinary tract—which also includes the ureters, bladder, and urethra. These two bean-shaped organs, located near the middle of your back just below the ribs (one on each side of the spine), work tirelessly around the clock.
Each day, your kidneys filter about 150 quarts of blood, removing excess water and waste to produce one to two quarts of urine. This urine travels down the ureters, into the bladder, and eventually exits through the urethra.
Beyond waste removal, kidneys help maintain fluid balance, regulate electrolyte levels like sodium and potassium, manage blood pressure, and even control the production of red blood cells. Think of your kidneys as your body’s built-in filtration and regulation system—quietly keeping things running smoothly in the background.
A kidney infection, also known as pyelonephritis, is a severe medical condition that can cause irreversible damage and potentially life-threatening complications if the infection enters the bloodstream. So the earlier it’s treated, the better.
Left untreated, a kidney infection can do more than just make you feel terrible—it can permanently damage your kidneys and lead to long-term health issues. In rare situations, this type of infection may contribute to kidney disease, high blood pressure, or even kidney failure. If the infection spreads to your bloodstream, it can trigger a serious and potentially fatal condition known as sepsis.
Recognizing the signs early and seeking prompt medical attention is essential to prevent these serious outcomes.
Luckily, antibiotic treatment is very effective against pyelonephritis. That said, you should make it a routine to see a doctor whenever you feel that something is amiss.
Cause of Kidney Infection
Approximately 37 million Americans have kidney diseases that may be life-threatening, yet most are not aware that they suffer from them.
The most common cause of a kidney infection is the entry of bacteria (Escherichia Coli. Pseudomonas, and Proteus) through the genitals and urethra into the urinary tract, multiplying and spreading to the kidneys.
Women have much shorter urethras than men, making them more susceptible to kidney infection.
There are other instances when the infection from other parts of your body spreads and infects your kidney; however, these are uncommon.
How Urine Flow Blockages Lead to Infections
The path urine takes from your kidneys to your bladder is meant to be a one-way street. When this flow gets disrupted or reversed, bacteria have an open invitation to move in and multiply, often sparking infection.
Blockages can pop up for a variety of reasons, including:
- Kidney stones that obstruct the passageways,
- Tumors pressing on or growing within the urinary tract,
- Structural abnormalities that you might be born with or develop over time.
Any of these issues can cause urine to back up, linger, or flow in the wrong direction. When urine stagnates or moves retrograde, it gives bacteria a cozy environment to thrive—and before you know it, you could be facing a kidney infection. This is why doctors pay close attention to anything that impedes urine flow, whether you’re dealing with stones, growths, or quirks in anatomy.
Untreated blockages can quickly pave the way for more serious complications, which is yet another reason to see your physician if you suspect anything is amiss.
Symptoms of Kidney Infection
The symptoms of a kidney infection include:
Atypical Symptoms in Children and Older Adults
It’s important to note that not everyone experiences kidney infection symptoms in the same way, especially at the extremes of age. In very young children—especially those under two—the only sign may be a persistent high fever, often with no clear pain or noticeable trouble with urination.
In contrast, older adults might not display the usual warning signs at all. Instead, they may become unusually confused, have trouble communicating, or even experience hallucinations. These changes can be sudden and severe, so if you notice such symptoms in a loved one, it’s crucial to seek medical care promptly. These atypical presentations can sometimes delay diagnosis, so maintaining a high level of suspicion is key, especially in these age groups.
Burning or pain while passing urine
Due to obstruction in the bladder, you may experience pain or a burning sensation when urinating, and if not diagnosed and treated early, the infection may spread to the kidneys.
Dehydration
Your urine will have a foul smell and may have a dark yellow or brown coloration, significant signs of dehydration.
Lower backache
If you have an active kidney infection, you may experience mild or acute pain in your lower back and sides.
Chills
You could also experience chills which could make the patient feel very cold. Shivering may also occur in extreme cases.
Fever
Fever is another symptom that could indicate that you have a kidney infection. Your fever may be mild or severe, depending on the progress of the disease. It is essential to check your temperature regularly and consult your doctor if you experience an unusual spike.
Nausea
Acute urinary infections can lead to tiredness or nausea. You may even experience an intense sensation of constantly vomiting as digestion can become difficult.
The immunity or disease-fighting ability of the body becomes very weak. Due to this, there is a possibility of being prone to other illnesses.
Generalized Weakness
Sometimes you may experience an overwhelming feeling all over. This feeling may disrupt your ability to perform daily tasks.
Diagnosis
Since most kidney infection symptoms arise from the urinary tract, primarily the kidney, bladder, urethra, and ureters, it isn’t that difficult to diagnose.
Your doctor will perform a physical examination and ask about your symptoms to decide on an appropriate diagnostic test. The tests your doctor may order include a urinalysis or a blood sample to check for the presence of bacteria in your blood.
Your doctor may order advanced tests such as an ultrasound, a CT scan, or cystourethrogram for an efficient diagnosis.
How Do Doctors Choose the Right Antibiotic?
To ensure effective treatment, your doctor will often collect a urine sample—and sometimes a blood sample—before starting any antibiotics. These samples are then tested to find out exactly which bacteria are causing the infection. By growing these bacteria in a lab, your healthcare provider can check which antibiotics will work best against them.
This process is important because some bacteria have developed resistance to certain antibiotics, making standard treatments less effective. Once the results are back, your doctor will select the most appropriate medication to target the specific type of bacteria causing your kidney infection, increasing the chances of a full recovery.
Treatment
In most cases, your doctor will prescribe antibiotics to treat kidney infection, and symptoms usually go away within a few days. However, in severe cases of infection, your doctor may need to admit you and prescribe a dedicated treatment in the form of antibiotics through an intravenous tube.
Typically, a course of antibiotics will be prescribed for at least two weeks to ensure the infection is fully treated and to prevent it from returning. If the infection is especially severe or you are unable to keep fluids or medication down, hospitalization may be necessary so that antibiotics can be given directly into your vein (IV). This approach helps the body heal more quickly and reduces the risk of complications or recurrence.
Your doctor will monitor your progress and may adjust the treatment as needed, depending on how you respond and the results of follow-up tests.
If you experience a recurring infection, your doctor will refer you to a specialist to determine the underlying cause.
Why Completing Your Antibiotics Matters
While you’ll likely notice a big improvement within just a few days of starting antibiotics, it’s critical to take every single dose prescribed—even if your symptoms vanish quickly. Stopping treatment early can allow some lingering bacteria to survive. These tough bacteria may not only bring your infection roaring back, but they can also become resistant to the very antibiotics meant to stop them. That can make future infections harder and more complicated to treat.
So, even if you feel back to your old self before you finish your medication, see it through to the final pill. This small step goes a long way in ensuring the infection is completely cleared and reduces your risk of complications down the road.
Antibiotic Resistance in Kidney Infections
It’s important to note that some bacteria responsible for kidney infections may develop resistance to certain antibiotics. This means that not every antibiotic will be effective against every infection. To ensure the best course of treatment, doctors will typically collect urine and sometimes blood samples before prescribing antibiotics. These cultures help pinpoint exactly which bacteria are present and determine which antibiotics will be most effective in your specific case. This careful approach helps maximize the chances of successful treatment and reduces the risk of complications.
Kidney Infection Treatment During Pregnancy
Kidney infections during pregnancy can pose risks to both mother and baby, so prompt medical attention is crucial. Fortunately, there are effective and safe antibiotics that your doctor can prescribe during pregnancy to clear up the infection. These medications are chosen specifically to avoid any harm to the developing baby while still treating the infection thoroughly.
Never attempt to self-medicate, as some over-the-counter drugs may not be safe in pregnancy. Always consult your healthcare provider if you notice symptoms such as burning urination, fever, chills, or back pain during pregnancy so you can begin the most appropriate treatment as soon as possible. Early intervention is the best way to ensure a healthy outcome for both you and your baby.
Special Considerations for Pregnant Women
If you’re pregnant and suspect you have a urinary tract infection, it’s crucial to see your doctor right away. Kidney infections during pregnancy can pose significant health risks for both mother and baby if left untreated.
Don’t wait for symptoms to worsen. Early intervention is key, and there are pregnancy-safe antibiotics available to treat the infection effectively. Prompt medical attention not only protects your health but also helps ensure a healthy pregnancy journey for you and your baby.
When Is Surgery Needed for Kidney Infections?
In rare circumstances, surgery may become necessary if your kidney infection is caused or worsened by an obstruction in the urinary tract—such as kidney stones, structural abnormalities, or congenital defects present from birth. These blockages can prevent urine from flowing properly, allowing bacteria to linger and multiply. If antibiotics alone aren’t enough to clear the infection because of such underlying issues, your doctor might recommend a surgical procedure to remove the obstruction and restore normal urine flow. Addressing these blockages quickly is essential to prevent further damage to your kidneys and minimize the risk of future infections.
Prevention
You can take several precautions to prevent kidney infection, and these include:
- Drink plenty of fluid to remove bacteria in the body through urination.
- Women should be cautious when they wipe after urinating and only wipe from front to back to avoid any bacteria from the anal area entering into the urethra.
- Avoid holding back when you have the urge to urinate.
- Regularly wash the area around the anus and vagina, avoid the use of harsh soaps, and clean this area gently to prevent skin irritation.
- You should always empty the bladder after sexual intercourse to clear the bacteria from the urethra, as this reduces the risk of infection.
Conclusion
Factors such as pregnancy, diabetes, and other abnormalities in the urinary system can increase the risk of developing kidney infections.
You are also more likely to develop a kidney infection if you experience frequent bladder infections or have a structural problem in your urinary tract. Normally, urine flows in a single direction—from the kidneys down to the bladder. However, when this flow is blocked or reversed, the risk of infection rises.
Common reasons for blocked or abnormal urine flow include:
- Kidney stones
- Tumors inside or outside the urinary tract
- Structural problems within the urinary system
People with weakened immune systems, such as those with diabetes, are especially vulnerable to infections. Pregnant women with urinary tract infections should seek prompt medical attention, as kidney infections during pregnancy can be particularly serious.
Special Considerations During Pregnancy
When it comes to pregnancy, kidney infections can present unique and serious risks for both the mother and the developing baby. Infections during this time may lead to complications such as preterm labor, low birth weight, or, in severe cases, harm to both maternal and fetal health. Pregnant women are naturally more susceptible to urinary tract infections due to hormonal changes and the physical pressure exerted by the growing uterus, which can slow urine flow and make it easier for bacteria to reach the kidneys.
Prompt assessment and treatment are critical. If a pregnant woman develops a kidney infection, her healthcare provider will closely monitor her and may recommend hospitalization to ensure both she and the baby are safe. Safe antibiotics are available and can be tailored to treat the infection effectively without posing harm to the pregnancy.
By seeking treatment early and following preventive steps, the risk of complications can be reduced, helping ensure a healthy outcome for both mother and baby.
So if your loved ones experience any of the symptoms of kidney infection, you should seek treatment to avoid further complications.
If you treat an active kidney infection early, it is possible to cure it and resume your everyday life.
