What Can Be the Cause of Gout?
Gout is fundamentally caused by chronic hyperuricemia (elevated serum uric acid levels) leading to monosodium urate (MSU) crystal deposition in joints and tissues, triggered by either overproduction or underexcretion of uric acid.
Primary Mechanism
The disease pathway begins with sustained elevation of serum urate levels that supersaturate body tissues, resulting in MSU crystal formation and deposition 1. However, it's critical to understand that hyperuricemia alone does not equal gout—not all individuals with elevated uric acid develop crystal deposition or symptomatic disease 2.
Risk Factors You Must Assess
According to the 2018 EULAR guidelines, you should systematically search for these risk factors in every person with gout 2:
Modifiable Dietary and Lifestyle Factors:
- Alcohol consumption (particularly beer and spirits)
- Purine-rich foods (meat and shellfish)
- Non-diet sodas (fructose-containing drinks)
- Obesity and overweight status
- High saturated fat intake 3
Medication-Related Causes:
- Diuretics (most common iatrogenic cause)
- Low-dose aspirin
- Cyclosporine
- Tacrolimus 2
These immunosuppressants are particularly problematic in transplant patients, where they can induce early, polyarticular, and rapidly tophaceous gout 4.
Medical Comorbidities:
The guidelines mandate systematic assessment for these associated conditions 2:
- Chronic kidney disease (decreased urate excretion)
- Hypertension
- Ischemic heart disease
- Heart failure
- Diabetes
- Dyslipidemia
- Metabolic syndrome and insulin resistance 3
Underlying Pathophysiology
Urate Handling Defects:
The primary mechanism in most patients is decreased renal or intestinal excretion of uric acid rather than overproduction 1. This is regulated by urate transporters, and genetic variability in these transporters strongly correlates with serum urate levels 1.
When to Suspect Overproduction:
If gout occurs in patients younger than 30 years, investigate for enzyme deficiencies (usually partial) that cause uric acid overproduction 4.
Important Clinical Pitfalls
Do not diagnose gout based on hyperuricemia alone 2—this is a Grade B recommendation with high agreement (8.9±0.2). The definitive diagnosis requires demonstration of MSU crystals in synovial fluid or tophus aspirates.
Gender and Age Considerations:
- Male gender is a significant risk factor 2
- Gout in women is increasingly common, often atypical, predominantly affecting the hands with rapid tophus development, and frequently associated with diuretic use 4
- Prevalence increases with age 5
Emerging Understanding
Recent evidence shows gout prevalence ranges from <1% to 6.8% globally and is rising due to increasing obesity and metabolic comorbidities 5. The disease involves complex interactions between the NLRP3 inflammasome and IL-1β-mediated inflammatory responses 1, but the fundamental trigger remains chronic hyperuricemia from the modifiable and non-modifiable factors listed above.