Gout: Symptoms, Causes, and Treatment

Gout

Gout is an inflammatory joint disease caused by the deposition of monosodium urate crystals in the joints and periarticular soft tissues. It is the most common form of inflammatory arthritis in adult men, with a growing prevalence in industrialized countries (1-4% of the population). Gout typically manifests with sudden attacks of intense pain, swelling, and redness of the joint, most frequently in the big toe (podagra), but it can affect any joint. If not adequately treated, it can evolve into a chronic form with permanent joint damage.

Pathophysiology

Uric acid and hyperuricemia

Uric acid is the final product of purine metabolism (components of DNA and RNA nucleic acids). Under normal conditions, about 70% of uric acid is eliminated by the kidneys and 30% by the intestine.

Hyperuricemia is defined when the level of uric acid in the blood exceeds 6.8 mg/dL (saturation point at 37°C). Above this threshold, monosodium urate can precipitate as crystals in the joints and tissues.

From crystal to acute attack

• Urate crystals deposit in cartilage, synovial fluid, and periarticular tissues.
• They are phagocytosed by macrophages and neutrophils.
• They activate the NLRP3 inflammasome, leading to massive production of interleukin-1β.
• A violent acute inflammatory response is triggered.

Not all people with hyperuricemia develop gout: only 20-25% of hyperuricemic individuals will experience at least one gout attack.

Causes of Hyperuricemia

Renal underexcretion of uric acid (90% of cases)

• Chronic kidney disease
• Medications: thiazide diuretics, cyclosporine, low-dose aspirin, pyrazinamide
• Metabolic acidosis: reduces renal urate excretion
• Chronic dehydration

Overproduction of uric acid (10% of cases)

• Purine-rich diet: red meat, offal, seafood, beer
• Myeloproliferative and lymphoproliferative diseases (high cell turnover)
• Tumor lysis syndrome (after chemotherapy)
• Hereditary enzymatic defects (HGPRT deficiency — Lesch-Nyhan syndrome)

Risk factors

Stages of Gout

1. Asymptomatic hyperuricemia

Elevated uric acid levels without symptoms. Can last for years or decades before a possible first attack. Not all hyperuricemic individuals will develop gout.

2. Acute gout (intermittent attacks)

Attack characteristics:

• Sudden onset, often at night or in the early morning hours
• Excruciating pain (described as the worst pain ever experienced)
• Joint is red, swollen, hot, extremely tender to the touch
• Even contact with a bedsheet can be unbearable
• Peaks in 12-24 hours, resolves in 7-14 days even without treatment
• Skin desquamation in the resolution phase

Most affected sites:

• 1st metatarsophalangeal joint (big toe): 50-70% of first attacks (podagra)
• Ankle and tarsus
• Knee
• Wrist and fingers
• Elbow

Triggering factors:

• Dietary or alcoholic excess
• Dehydration
• Joint trauma
• Surgery or acute illness
• Initiation or modification of urate-lowering drugs (paradoxically)
• Abrupt climate changes

3. Intercritical gout

Periods between attacks, completely asymptomatic. Over time, the intervals shorten, and attacks become more frequent and polyarticular.

4. Chronic tophaceous gout

• Visible and palpable urate deposits (tophi) in joints, ears, tendons, bursae
• Chronic arthropathy with cartilage and bone damage
• Joint deformities
• Possible renal insufficiency due to urate deposition in the kidneys (urate nephropathy)
• Develops after years of untreated gout

Diagnosis

Clinical examination

• Typical clinical picture: acute monoarthritis of the big toe with striking inflammatory signs
• Presence of tophi
• Anamnesis: recurrent episodes, risk factors

Laboratory tests

• Uricemia: > 6.8 mg/dL (can paradoxically be normal during an acute attack)
• Synovial fluid analysis: gold standard — identification of negatively birefringent monosodium urate crystals under polarized light
• ESR, CRP: elevated during the attack
• Complete blood count: neutrophilic leukocytosis
• Renal function: creatinine, GFR
• 24h uric acid excretion: to distinguish overproducers from underexcretors

Instrumental examinations

• X-ray: normal in early stages. In chronic gout: “rat-bite” erosions with sclerotic margins and preserved trabeculae
• Joint ultrasound: double contour sign (crystal deposition on the cartilage surface), tophaceous aggregates, snowstorm sign in synovial fluid
• Dual Energy CT (DECT): identifies urate deposits with high specificity, useful in doubtful cases
• Magnetic resonance imaging: evaluation of tophi and joint damage

Treatment of Acute Attack

Pathophysiology is the study of how disease processes alter normal body functions at cellular, tissue, and organ levels. The goal is rapid resolution of pain and inflammation. Treatment is most effective if started within the first 12-24 hours.

First-line drugs

NSAIDs:

• Indomethacin, naproxen, diclofenac at full dosage
• Avoid aspirin (interferes with urate excretion)
• Contraindicated in renal insufficiency, gastric ulcer, heart failure

Colchicine:

• Effective if administered within the first 12 hours
• Low-dose regimen: 1 mg immediately, then 0.5 mg after 1 hour (total 1.5 mg on the first day)
• Dose-dependent side effects: diarrhea, nausea

Corticosteroids:

• Oral (prednisone 30-40 mg/day for 5-7 days) or intra-articular
• Indicated when NSAIDs and colchicine are contraindicated
• Effective and rapid

Local therapy:

• Cryotherapy (ice packs) on the inflamed joint
• Relative joint rest
• Limb elevation

Long-Term Treatment (Urate-Lowering Therapy)

Indications

Urate-lowering therapy is indicated when:

• Recurrent attacks (≥ 2/year)
• Presence of tophi
• Joint or kidney damage from gout
• Urate kidney stones

Medications

Allopurinol:

• Xanthine oxidase inhibitor, reduces uric acid production
• First-choice drug, low initial dose (100 mg/day) with gradual increase
• Target: uricemia < 6 mg/dL (< 5 mg/dL if tophi)

Febuxostat:

• Alternative to allopurinol, same mechanism of action
• Indicated in case of allopurinol intolerance or mild-moderate renal insufficiency

Probenecid:

• Uricosuric (increases renal urate excretion)
• Indicated in underexcretors with good renal function

Prophylaxis during initiation of urate-lowering therapy:

• Low-dose colchicine (0.5-1 mg/day) for the first 3-6 months
• Prevents the paradox of gout attacks triggered by lowering uricemia

Role of Physiotherapy

Physiotherapy plays an important role in the management of gout, especially in the intercritical phase and in chronic gout.

During the acute attack

• Relative rest of the affected joint
• Cryotherapy: 15-20 minutes, several times a day
• Positioning: limb elevation, avoid direct pressure on the joint
• Gentle, non-painful mobilization after the inflammatory peak (from day 3-4)

Intercritical phase

Joint mobilization:

• Recovery of full ROM of the affected joint
• Passive and active assisted mobilization
• Stretching of periarticular tissues

Muscle strengthening:

• Strengthening of the musculature surrounding the affected joint
• Global lower limb strengthening exercises (if ankle or knee are affected)
• Exercises for foot and ankle stability

Physical activity:

• Encourage regular low-impact physical activity: walking, swimming, cycling
• Physical exercise contributes to weight control and metabolic syndrome
• Avoid high-impact activities during flare-ups

Chronic gout with deformities

• Braces and orthoses to protect and support deformed joints
• Custom orthotics for foot gout
• Footwear adaptation
• Occupational therapy for hands (if affected)

Diet and Lifestyle

Foods to limit (high purine content)

• Offal (liver, kidneys, brain, sweetbreads)
• Excessive red meat
• Seafood (shellfish, sardines, anchovies, herring)
• Beer (rich in purines and hinders urate excretion)
• Spirits
• Sugary drinks with fructose

Recommended foods

• Low-fat dairy products (documented protective effect)
• Vegetables (even those with moderate purine content: spinach, asparagus, mushrooms — do not increase risk)
• Fruit (in moderation due to fructose)
• Whole grains
• Coffee (moderate protective effect)
• Vitamin C (500-1000 mg/day, mild uricosuric effect)
• Cherries and cherry extract (limited but promising evidence)

Lifestyle

• Adequate hydration: at least 2 liters of water per day
• Weight control: gradual weight loss reduces uricemia
• Regular physical activity: 150 minutes/week of moderate activity
• Avoid drastic diets: prolonged fasting can trigger attacks

Recovery Times

Frequently Asked Questions (FAQ)

Frequently Asked Questions

What is the role of a physical therapist in managing gout?

A physical therapist assists in managing pain and inflammation during acute gout attacks. They also help restore joint function and mobility in intercritical and chronic phases, providing guidance on exercises and lifestyle modifications to improve long-term outcomes.

What are the different stages of gout?

Gout progresses through distinct stages, starting with asymptomatic hyperuricemia where uric acid levels are elevated without symptoms. This can advance to acute attacks, followed by intercritical periods between flares, and potentially chronic tophaceous gout if untreated, leading to permanent joint damage.

How is gout diagnosed?

Diagnosis of gout typically involves a clinical examination of affected joints and laboratory tests to measure uric acid levels. Instrumental examinations, such as imaging or joint fluid analysis, may also be utilized to confirm the presence of urate crystals and assess joint damage.

What are the typical recovery times for an acute gout attack?

An acute gout attack often resolves within two weeks, even without specific treatment. However, prompt medical intervention can significantly reduce the duration and severity of symptoms, facilitating a quicker return to normal activities.

Sources and Scientific References

1. Sivera F et al. (2017). Gout: Diagnosis and treatment. Med Clin (Barc). 148:271-276. DOI | PubMed
2. Zhang T et al. (2024). Exercise and hyperuricemia: an opinion article. Ann Med. 56:2396075. DOI | PubMed
3. Drosos GC et al. (2022). EULAR recommendations for cardiovascular risk management in rheumatic and musculoskeletal diseases, including systemic lupus erythematosus and antiphospholipid syndrome. Ann Rheum Dis. 81:768-779. DOI | PubMed
4. Kharouf F et al. (2024). Advances in the management of psoriatic arthritis in adults. BMJ. 387:e081860. DOI | PubMed
5. Jia E et al. (2022). The effects of aerobic exercise on body composition in overweight and obese patients with gout: a randomized, open-labeled, controlled trial. Trials. 23:745. DOI | PubMed