Does gout increase risk of kidney stones? 

Gout is widely known for causing intense joint pain, but the underlying cause, high levels of uric acid, can affect other parts of the body, most notably the kidneys. Uric acid is a waste product that the kidneys are responsible for filtering from the blood and excreting through urine. When these levels become too high, a condition known as hyperuricaemia, the excess acid can crystallise. While these crystals often settle in the joints to cause gout, they can also form in the urinary tract, leading to the development of kidney stones. Understanding this connection is vital for long-term health management, as the kidneys and joints are closely linked in the metabolic process of uric acid regulation. This article explores why gout increases the risk of stones and how you can protect your renal health following NHS guidance on kidney stones. 

What We’ll Discuss in This Article 

• The biological link between hyperuricaemia and stone formation. 

• The specific type of kidney stones most common in gout patients. 

• How acidic urine contributes to the crystallisation of uric acid. 

• Symptoms that indicate a kidney stone may be present. 

• The role of hydration and diet in preventing both gout and stones. 

• How urate-lowering medications affect kidney health. 

• Frequently asked questions about gout and renal complications. 

The Biological Link Between Gout and Stones 

The relationship between gout and kidney stones is rooted in the body’s inability to manage uric acid effectively. Approximately 1 in 5 people with gout will also develop kidney stones. This occurs because the same uric acid that causes joint inflammation can become concentrated in the urine. 

When the concentration of uric acid in the urine reaches a saturation point, it begins to form solid crystals. Over time, these crystals clump together to form stones. There are two primary ways gout contributes to this: 

1. Excess Production: If your body produces too much uric acid, the kidneys are overwhelmed by the volume they must filter. 

2. Poor Excretion: If the kidneys are not flushing out uric acid efficiently, it sits in the urinary system for longer, increasing the chance of stone formation. 

Uric Acid Stones vs. Calcium Stones 

While the most common type of kidney stone in the general population is made of calcium, people with gout are significantly more likely to develop uric acid stones. These stones are unique because they thrive in an acidic environment. If your urine has a low pH (meaning it is more acidic), uric acid remains insoluble and turns into crystals much more easily. 

Identifying the Symptoms of Kidney Stones 

Kidney stones may not cause symptoms until they begin to move within the kidney or pass into the ureter, the tube linking the kidney to the bladder. If you have gout, you should be vigilant for the following signs: 

• Severe Pain: Often felt in the side of the abdomen, the back, or the groin (renal colic). 

• Urinary Changes: Blood in the urine, a persistent need to urinate, or pain during urination. 

• Systemic Symptoms: Nausea, vomiting, or a general feeling of being unwell. 

If you experience severe pain accompanied by a high temperature or shivering, this can indicate a kidney infection or a blockage, both of which require urgent medical attention. 

Preventing Stones While Managing Gout 

The strategies for preventing kidney stones often overlap with those used to manage gout, making it possible to address both issues simultaneously through lifestyle and medical care. 

• Hydration: This is the most critical factor. Drinking 2 to 3 litres of water daily dilutes the urine, making it much harder for uric acid crystals to clump together. 

• Alkalising the Urine: In some cases, doctors may suggest ways to make the urine less acidic, which helps uric acid stay dissolved so it can be passed safely. 

• Dietary Adjustments: Reducing high-purine foods (like red meat and shellfish) lowers the total amount of uric acid your kidneys have to process. 

• Medication: Urate-lowering therapies like allopurinol not only reduce the risk of joint flares but also lower the amount of uric acid the kidneys are exposed to, reducing stone risk. 

Differentiating Gout Complications 

It is important to understand how gout can affect different systems so you can report symptoms accurately to a healthcare professional. 

Condition	Primary Location	Key Symptom
Acute Gout	Joints (e.g., Big Toe)	Sudden, red, hot swelling.
Tophi	Under skin/near joints	Firm, chalky lumps.
Kidney Stones	Back/Abdomen/Ureter	Intense, cramping “wave” of pain.
Septic Arthritis	Joints	Severe pain with fever (Emergency).

Conclusion 

Gout significantly increases the risk of developing kidney stones, particularly those made of uric acid. This connection highlights that gout is more than just a joint condition, it is a systemic metabolic issue that requires a holistic approach to health. By maintaining high levels of hydration, managing your diet, and following prescribed medical treatments, you can protect both your joints and your kidneys. Preventing the build-up of uric acid is the most effective way to avoid the dual burden of joint flares and the intense pain of kidney stones. 

If you experience severe, sudden, or worsening symptoms, especially if accompanied by a high fever, call 999 immediately. This is essential if you have severe back pain and a temperature, as it may indicate a serious kidney infection or a blocked urinary tract.⁸ 

Authority Snapshot 

Dr. Stefan Petrov is a UK,trained physician with an MBBS and postgraduate certifications in general and emergency medicine. He has extensive experience in hospital wards and intensive care units, managing the renal and metabolic complications associated with chronic inflammatory conditions. Dr. Petrov is a dedicated medical educator, focusing on delivering safe, evidence,based health guidance that aligns with NHS and NICE standards. His expertise ensures this article provides a reliable overview of the link between gout and kidney health for the general public.