Acute, intense lower back pain caused by a kidney stone blocking the urinary tract. Distension of the kidney upstream triggers a particularly sudden pain, often described as one of the most intense (HAS and AFU recommendations). It occurs within a few minutes, without any identifiable trigger. It constitutes a medical emergency requiring prompt treatment.

Seek urgent care or call 15 immediately if you have a fever above 38 °C with chills (pyelonephritis—a medical emergency). Anuria (absence of urine) or a single kidney. Unbearable pain that does not respond to pain medication. Uncontrollable vomiting preventing hydration. Pregnancy, diabetes, kidney failure, or immunosuppression. Pain persisting beyond 48–72 hours. An emergency physician will evaluate the patient, order tests (blood tests, urine culture, ultrasound, or CT scan), and refer the patient to a urologist (extracorporeal shock wave lithotripsy, ureteroscopy).

Understanding and Managing Renal Colic Naturally

Q: How can it be recognized?

Sudden, intense, one-sided lower back pain radiating to the lower abdomen, groin, or genitals. Restlessness: the patient searches in vain for a position that provides relief. Frequent urge to urinate; urine may be cloudy or pinkish (hematuria). Nausea and vomiting are frequently associated. Sweating, pallor, and sometimes abdominal distension. The absence of a fever does not rule out a serious condition; fever, chills, or signs of sepsis require urgent medical attention (call 15 or 112).

Q: What emergency measures should be taken?

Seek urgent medical care or call 15 for evaluation. Moderate fluid restriction during the attack (contrary to popular belief: drinking too much increases pain). Nonsteroidal anti-inflammatory drugs (NSAIDs) if there are no contraindications, as prescribed by a doctor. Antispasmodics as prescribed. Apply local heat to the lower back (warm water bottle). Self-medication with NSAIDs in the elderly, people with diabetes, those with kidney failure, or those taking anticoagulants or corticosteroids: strict medical supervision required.

Q: How can recurrences be prevented?

Risk of recurrence is 50% at 5 years (AFU). Drink plenty of fluids (2–2.5 L of water per day; urine should be clear). Reduce salt intake (less than 6 g per day). Moderate protein intake (1 g/kg/day); limit excessive animal protein. Limit foods high in oxalates in cases of oxalate stones (spinach, rhubarb, Swiss chard, dark chocolate, nuts, strong tea) as directed by a doctor. Normal calcium intake (800–1,000 mg/day): calcium restriction paradoxically increases the risk. Eat sufficient amounts of fruits and vegetables. Regular physical activity; maintain a healthy weight. Analysis of the recovered stone to tailor treatment precisely.

What is renal colic?

Renal colic is a sudden, intense pain in the lower back caused by a kidney stone blocking the urinary tract. Dilation of the kidney upstream triggers a particularly sudden pain, often described as one of the most intense pains imaginable (HAS and AFU recommendations).

It occurs within a few minutes, without any identifiable trigger, and constitutes a medical emergency requiring prompt treatment. Additional resources are available for kidney stones in general.

How can it be recognized?

Several characteristic signs point to the diagnosis:

Sudden, intense,unilateral lower back pain radiating to the lower abdomen, groin, or genital area
Restlessness: the patient searches in vain for a position that provides relief
Frequent urge to urinate, sometimes with cloudy or pink-tinged urine (hematuria)
Nausea and vomiting are frequently associated
Sweating, pallor, and sometimes abdominal distension

The absence of a fever does not rule out a serious condition; however, a fever, chills, or signs of sepsis require urgent medical attention (call 15 or 112).

What emergency measures should be taken?

When an episode occurs, several steps are necessary:

Seek emergency care or call 15 for an evaluation
Moderate fluid restriction during the attack (contrary to popular belief: drinking too much increases pain)
Nonsteroidal anti-inflammatory drugs (NSAIDs), if there are no contraindications, as prescribed by a doctor
Antispasmodics as prescribed
Applylocal heat to the lower back (warm hot water bottle)

Self-medication with NSAIDs in older adults, people with diabetes, patients with kidney failure, or those taking anticoagulants or corticosteroids requires strict medical supervision. Specific resources are available for pain management andkidney failure in general.

How can recurrences be prevented?

After an initial episode, the risk of recurrence reaches 50% within 5 years, according to AFU recommendations. Several measures can reduce this risk:

Adequate hydration: 2 to 2.5 L of water per day, spread out over 24 hours; clear urine is an indicator
Salt reduction: less than 6 g/day, as recommended
Moderate protein intake (1 g/kg/day), limiting excessive animal protein
Limiting foods high in oxalates in cases of oxalate stones (spinach, rhubarb, Swiss chard, dark chocolate, nuts, strong tea) as advised by a doctor
Normal calcium intake (800–1,000 mg/day): calcium restriction paradoxically increases the risk
Sufficient amounts offruits and vegetables (promotes urinary alkalization)
Regular physical activity; weight management

An analysis of the recovered stone allows for precise tailoring of preventive measures. Specific resources are available regardinghydration and magnesium in general.

When should you seek immediate medical attention?

Several situations require urgent medical attention, or even a call to 15:

Fever over 38 °C with chills (pyelonephritis, a medical emergency)
Anuria (absence of urine) or a single kidney
Unbearable pain that does not respond to pain medication
Uncontrollable vomiting preventing hydration
Pregnancy, diabetes, kidney failure, immunosuppression
Painpersisting beyond 48 to 72 hours

The emergency physician evaluates the patient, orders tests (blood tests, urine culture, ultrasound, or CT scan), and refers the patient to a urologist as appropriate (extracorporeal shock wave lithotripsy, ureteroscopy). Your licensed pharmacist remains a valuable resource for guiding daily preventive measures and identifying warning signs, in addition to urological follow-up. Specific resources are available for cystitis in general.