Kidney stones (urolithiasis) – causes, symptoms, treatment and prevention
Kidney stones, known medically as urinary lithiasis, are a common urological condition that can affect people of all ages. Although in some cases they can progress without obvious symptoms, kidney stones are often associated with episodes of intense pain that lead to emergency medical visits.
The formation of urinary calculi occurs when certain substances in the urine become excessively concentrated and crystallize. Depending on their size and location, stones can remain asymptomatic or cause lower back pain, urination disorders, or complications such as urinary tract infections or urinary tract blockages. Men are affected more frequently, but the incidence of urinary lithiasis is also increasing among women.
In most situations, kidney stones can be managed effectively if diagnosed in time. Therefore, recognizing symptoms and undergoing a urological evaluation are important for establishing appropriate treatment and preventing recurrences and complications.
What are kidney stones (urinary lithiasis)
Kidney stones are solid formations that appear in the urinary tract when certain substances in the urine concentrate and deposit in the form of crystals. These formations are known as urinary calculi, and the process of formation is called urinary lithiasis.
Normally, urine contains dissolved salts and minerals, which are eliminated from the body without difficulty. When the amount of fluids is insufficient or there is an imbalance of these substances, they can begin to accumulate and form stones.
Urinary calculi can be located in different areas of the urinary tract, such as:
- kidneys
- ureters
- urinary bladder
The size of kidney stones can vary from very small particles, eliminated spontaneously, to larger formations that can block urinary flow. In some cases, stones may be discovered by chance following investigations performed for other conditions, without the patient presenting obvious symptoms.
Identifying the presence of kidney stones and a urological evaluation are important for establishing appropriate therapeutic conduct and preventing complications.
Types of kidney stones
Kidney stones can have different compositions, and the type of urinary calculus influences both the treatment and the prevention recommendations. For this reason, identifying the type of stone is important in the complete evaluation of urinary lithiasis.
The most common types of kidney stones are:
- calcium stones, the most common, usually formed from calcium oxalate or phosphate
- uric acid stones, which appear more frequently in people with acidic urine
- struvite stones, usually associated with repeated urinary tract infections
- cystine stones, rare, with a genetic determination
Each type of stone may require a different approach in terms of treatment and prevention. Therefore, in certain situations, the urologist may recommend additional tests to identify the composition of the urinary calculi.
Causes of kidney stones
Kidney stones usually appear as a result of an excessive concentration of certain substances in the urine. When the urine becomes too concentrated, salts and minerals can crystallize and form urinary calculi. This process is favored by several factors, which can act individually or in combination.
One of the most common causes is insufficient hydration. Low fluid consumption leads to a smaller amount of urine, which favors the deposition of crystals. This risk is higher during periods of high temperatures or for people who lose fluids through sweating without replacing them properly.
Other important causes include:
- unbalanced diet, especially excessive salt consumption
- increased intake of animal protein
- certain metabolic conditions
- repeated urinary tract infections
In some situations, genetic predisposition can contribute to the occurrence of kidney stones. People who have had family members diagnosed with urinary lithiasis have a higher risk of developing this condition.
Identifying the causes is important for establishing appropriate treatment and reducing the risk of recurrence.
Risk factors
There are a number of factors that can increase the risk of kidney stones, even in the absence of obvious causes. These factors are important to know because they can influence the frequency of recurrences and the progression of urinary lithiasis.
Kidney stones occur more frequently in:
- men
- adults aged between 30 and 60
- people with a family history of urinary lithiasis
Certain lifestyle factors can favor the formation of urinary calculi, such as:
- insufficient fluid consumption
- diet high in salt
- increased intake of animal protein
- sedentary lifestyle
Also, the risk is higher for people who have previously had episodes of kidney stones, as well as for those suffering from certain metabolic or urinary conditions. In these situations, urological evaluation and monitoring are important for preventing complications.
Symptoms of kidney stones
Symptoms of kidney stones can vary depending on the size and location of the urinary calculi. In some cases, stones can be present without causing symptoms, being discovered by chance following imaging investigations performed for other conditions.
When stones do not block the urinary flow, obvious manifestations may not appear. In these situations, the patient may:
- not feel pain
- have normal urination
- not show signs of infection
On the other hand, when a stone moves along the urinary tract, characteristic symptoms can appear.
The most common symptoms of kidney stones include:
- lower back pain, sometimes intense
- pain radiating toward the lower abdomen or groin area
- blood in the urine
- frequent or painful urination
The pain can appear suddenly and vary in intensity, often described as an episode that is difficult to endure.
In certain situations, kidney stones can be accompanied by other manifestations, such as:
- nausea or vomiting
- fever and chills, in the case of an associated infection
- general state of discomfort
The appearance of these symptoms requires a medical evaluation to determine the exact cause and appropriate treatment.
When kidney stones represent an emergency
Although not all kidney stones require an emergency doctor visit, there are situations where urinary lithiasis can become a serious medical problem. In these cases, rapid intervention is important for preventing complications.
It is recommended to seek emergency medical attention or contact medical services when the following appear:
- intense pain that does not subside
- fever or chills
- persistent nausea and vomiting
- difficulty or inability to urinate
These symptoms may indicate a blockage of the urinary tract or an associated infection, situations that require immediate medical evaluation.
Also, seeing a doctor is necessary when the pain is accompanied by a decrease in the amount of urine or an altered general state. Delaying the medical evaluation can lead to worsening symptoms and impaired kidney function.
Recognizing emergency signs and promptly addressing a urologist contributes to reducing the risk of complications and correct management of urinary lithiasis.
Diagnosis
Establishing the correct diagnosis is an important step in evaluating kidney stones. Although symptoms may suggest the presence of urinary lithiasis, confirmation is made based on medical investigations recommended by the urologist.
Frequently used investigations include:
- urine tests, which can reveal the presence of blood, crystals, or signs of infection
- blood tests, useful for evaluating kidney function and certain metabolic imbalances
- ultrasound of the urinary system, a non-invasive method frequently used for identifying calculi
In certain situations, especially when symptoms are intense or the diagnosis is not clear, the doctor may recommend additional imaging investigations to accurately determine the size and location of the stones.
Urological evaluation allows not only the confirmation of the diagnosis but also the choice of the most suitable treatment strategy, adapted to each patient.
Treatment of kidney stones
The treatment of kidney stones is established based on the size of the calculi, their location, the intensity of the symptoms, and the patient’s general health. In many cases, surgery is not necessary, and the treatment can be adapted according to the progression of each case.
In situations where the stones are small and do not cause severe symptoms, the urologist may recommend:
- increasing fluid intake
- medication for pain control
- monitoring the progression of the calculi
These measures can allow the stones to pass spontaneously without other interventions.
When symptoms are more intense or stones cannot be eliminated spontaneously, treatment may include:
- medication to reduce pain and inflammation
- treatments that facilitate the elimination of calculi
- minimally invasive procedures, depending on the case
The urologist will choose the most appropriate therapeutic option, taking into account the particularities of each patient. Following medical recommendations is important for reducing the risk of complications and for a proper recovery.
Prevention of urinary lithiasis recurrence
After an episode of kidney stones, the risk of urinary lithiasis reappearing is increased. Therefore, prevention plays an important role in the long-term management of this condition and in reducing the risk of recurrence.
One of the most effective prevention measures is proper hydration. Adequate fluid consumption helps dilute the urine and prevent the formation of crystals. A constant intake of fluids throughout the day is recommended, adapted to the level of activity and environmental conditions.
Other useful prevention measures include:
- reducing salt consumption
- maintaining a balanced diet
- avoiding excessive animal protein
- following medical recommendations
For people with repeated episodes of urinary lithiasis, the urologist may recommend periodic monitoring and additional investigations to identify the factors that favor recurrence.
Adopting these measures contributes to the effective management of kidney stones and the maintenance of the urinary system’s health.
Correct management of kidney stones
Kidney stones are a common urological condition that can progress differently from one patient to another. While some people may have urinary calculi without obvious symptoms, others face painful episodes that require medical evaluation. For this reason, the correct management of urinary lithiasis requires an approach adapted to each case.
The correct diagnosis and the establishment of appropriate treatment are essential for preventing complications, such as urinary infections or impaired kidney function. Urological evaluation allows for the selection of the most suitable therapeutic strategy and monitoring of progression over time.
In the long term, prevention plays an important role in reducing the risk of recurrence. Following medical recommendations, proper hydration, and periodic check-ups can contribute to maintaining the health of the urinary system. Through a correct and timely approach, kidney stones can be managed effectively, with a reduced impact on the quality of life.
