All you know, kidneys are an important organ in our body. These bean-shaped organs, located on either side of the spine, help in filtering out excess fluid from the blood, regulating blood pressure, and balancing electrolytes. Beyond these critical functions, the kidneys also produce hormones that stimulate the production of red blood cells and support bone health. 

Thus, it can be said that kidneys are fundamental to maintaining the body’s internal balance and overall health. Having established the vital role of the kidneys, let us now discuss the primary topic of this article which is kidney infection and their complications.

What is a kidney infection?

Kidney infection is a Urinary Tract Infection (UTI), also known as pyelonephritis which is mainly caused by a bacteria or virus. These infections often arise in the lower urinary tract, including the bladder. Once inside, the bacteria usually travels up in one or both kidneys through the ureter.¹ Thus, impacting the kidneys in one or more significant ways. If not treated well, it can cause severe health issues and even permanent damage to the kidneys.

Below is the list of symptoms that can help an individual identify a potential kidney infection, thus prompting them to seek medical attention-

• Burning feeling or pain when urinating
• Pain in the flank, pelvis or back
• Stomachache
• Chills
• Blood in urine
• Foul-smell urine
• Fatigue²

It is however to note that some individuals are more prone to kidney infections. This group includes pregnant women, individuals who had UTI during the past 12 months, people with diabetes, those with spinal cord injury and those suffering from urinary retention.

What are the complications of kidney infections?

Understanding the potential complications of kidney infections is essential to grasp the severity of this condition and emphasize the urgency for prompt treatment. Let us now explore some potential complications associated with kidney infections.

1. Renal Scarring- Renal scarring, also termed as febrile UTI is a condition in which there is the development of scar tissue in the kidney which can result in kidney damage and subsequently kidney failure. This scar is often developed in order to repair the damaged tissue and heal the injury but can lead to long-term complications. Various tests including ultrasound, CT scans, or MRI scans help in visualizing the kidneys and observing the scar formed³
2. High blood pressure- The kidney’s ability to regulate blood pressure is altered due to kidney infections. The rise in blood pressure is both a cause and a consequence of kidney problems. Additionally, the presence of infection can trigger inflammation and oxidative stress in kidneys which further contribute to the rise in blood pressure. High blood pressure can be diagnosed by urinalysis, blood tests and other Kidney Function Tests (KFTs)⁴
3. Chronic Kidney Failure- Chronic kidney failure is a serious and life-threatening complication of kidney infections which further leads to the inability of kidneys to regulate fluid retention, electrolyte imbalance and reduce the levels of erythropoietin. The decrease in this hormone contributes to anaemia. Furthermore, chronic kidney failure can lead to a variety of additional complications including:
   • Cardiovascular complications: Various studies depict that there is a significant rise in cardiovascular diseases including heart attack, heart failure and stroke.⁵ This primarily occurs due to hypertension and the buildup of toxins in the blood, also referred to as septicemia
   • Bone disease: Kidney infection often leads to abnormalities in the metabolism of bones, thus leading to pain in the bone, fractures and elevated risk of osteoporosis. Additionally, the degradation in the levels of calcium and phosphorus contributes to these issues
4. Sepsis- Sepsis is generally referred to as a condition in which the body’s immune response to an infection becomes dangerously exaggerated. It can trigger widespread inflammation, potentially causing harm to issues, organ dysfunction and in severe cases, death of the patient. Kidneys in general, help in filtering the excess waste and fluids from the blood. In case of kidney infection, these bloodstreams become contaminated. The immune system in response releases inflammatory chemicals to fight off the infection and thus can contribute to sepsis
5. Kidney abscess- Another complication which can occur due to kidney infection is a renal abscess. This occurs when there is multiplication and spread of bacteria (Escherichia coli) in either of the kidneys. The common symptoms include abdominal pain, nausea, vomiting and rapid heart rate⁶
6. Renal Papillary Necrosis- Renal papillary necrosis is a severe complication which is characterized by the death of the renal papillae caused by a kidney infection. This often results in the case of recurrent infections. Furthermore, the reduced blood flow, often termed ischemia and inflammation results in necrosis. This inflammation can result in the development of blood clots within the tiny blood vessels that provide blood to renal papillae⁷
7. Pregnancy complications- Pregnancy complications are generally observed in women with kidney infections. These often include the risk of preterm birth of a baby, which further contributes to low birth weight (less than 5.5 pounds). These complications occur mainly due to hormonal and physiological changes in a pregnant woman.⁸ Thus, seeking medical attention is necessary to ensure the best possible outcomes for the mother and the baby

Preventions of kidney infections

• Stay Hydrated
• Urinate regularly
• Avoid irritants such as harsh soaps and douches
• Maintain a healthy diet
• Take prompt treatment of UTIs
• Avoid prolonged use of catheters

Treatment

As highlighted throughout this article, kidney infections can be unpredictable and pose significant risks to health. Thus, it is necessary to prioritize treatments to mitigate these potential complications. The common treatment includes the consumption of antibiotics. Some common examples include- 

• Trimethoprim-Sulfamethoxazole
• Amoxicillin-Augmentin
• Ciprofloxacin- Levofloxacin⁹

It is important to complete the course of antibiotics to avoid antibiotic resistance, which is a common issue with antibiotics.

Other treatment options include the consumption of pain relievers such as NSAIDs.

Conclusion

In conclusion, kidney infections can have serious implications on health. They can lead to severe conditions such as sepsis, a life-threatening complication that occurs when the infection spreads to the bloodstream, and long-term issues such as chronic kidney damage, which may affect overall kidney function and quality of life. By emphasizing the importance of early detection, appropriate treatment, and effective management, many of these outcomes can be mitigated.

Early detection plays a critical role in preventing complications. Recognizing symptoms like fever, chills, back pain, and changes in urinary habits such as cloudy or foul-smelling urine should prompt individuals to seek medical attention before the infection progresses. Timely diagnosis and intervention can ensure that treatment, typically involving antibiotics, is effective and reduces the risk of recurrence or escalation.

Management of kidney infections does not end with medical treatment; long-term care and lifestyle modifications are equally crucial. Individuals must be vigilant and adopt preventive measures to safeguard their kidney health. Simple actions, such as staying hydrated, maintaining good personal hygiene, and consuming a balanced diet rich in nutrients, can significantly reduce the risk of infections. Avoiding excessive salt intake, alcohol, and processed foods also contributes to better kidney health.

Raising awareness about kidney infections and educating individuals on preventive care can empower people to take charge of their health. With more knowledge and better healthcare access, we can collectively improve outcomes, reduce the prevalence of severe complications, and enhance the lives of those affected by kidney infections.