What Is Gout? Symptoms, Causes, Treatment

What Is Gout? Symptoms, Causes, Treatment

What Is Gout?

  • Gout is caused by chronically high blood uric acid crystallizing in the joints, triggering acute inflammation
  • Key symptoms: sudden, severe joint pain with redness and swelling, often starting at the big toe
  • High-purine foods to limit: organ meats, certain seafood, beer/alcohol
  • Treatment has two phases: anti-inflammatory medication (e.g., Colchicine) during flares, urate-lowering therapy (e.g., Allopurinol) long-term
  • ⚠️ Do not start long-term urate-lowering therapy during an active flare — it can prolong the attack
  • Severe pain, high fever, or frequent recurrence warrant medical evaluation for long-term management
Supatcheree A., Pharmacist

Medically reviewed by

Supatcheree A., Pharmacist | แหล่งข้อมูล: NHS, Arthritis Foundation, ACR, NCBI, Cleveland Clinic, NIH

Last reviewed: 2026-07-09

What Is Gout? What Causes It?

Gout is a type of arthritis caused by prolonged high levels of uric acid in the blood. Over time, uric acid crystallizes into monosodium urate crystals that accumulate in the joints. When the body reacts to these crystals, it triggers sudden, severe inflammation — intense pain, swelling, redness, and warmth.

Where does uric acid come from?

Uric acid is a waste product from the breakdown of purines, found in certain foods and produced naturally by the body's own cells. Normally, the kidneys filter out excess uric acid through urine. But when the body produces too much, or the kidneys excrete too little, uric acid builds up in the blood.

Who is at risk for gout?

  • Working-age men 30-50 years old (3-4 times more common than women)
  • People who are overweight or obese
  • Regular alcohol drinkers, especially beer
  • Frequent consumption of high-purine foods
  • Underlying conditions like high blood pressure or chronic kidney disease
  • Family history of gout

Causes of Gout — Why Uric Acid Builds Up in Joints

High blood uric acid (hyperuricemia) results from two main mechanisms:

1. The body produces too much uric acid

Usually from regularly eating high-purine foods, or conditions where cells break down abnormally fast (such as during certain cancer treatments).

2. The kidneys excrete too little uric acid

This is the most common cause — from reduced kidney function with age, chronic kidney disease, dehydration, or certain medications (such as thiazide diuretics).

Why does it crystallize at the big toe joint especially?

Joints in the extremities run cooler than the rest of the body, making uric acid crystallize more easily there. This is why the big toe joint is affected most often, followed by the ankle, knee, and finger joints.

Gout Symptoms — What Does an Acute Flare Feel Like?

A gout flare typically strikes suddenly, often at night or early morning, with these hallmark features:

  • Severe pain — so intense that even a blanket touching the joint is unbearable
  • Swelling, redness, and warmth that develop visibly within hours
  • Shiny, tight skin around the affected joint
  • Usually starts at the big toe joint, then may spread to the ankle or knee
  • Peaks in intensity within 12-24 hours, then gradually improves over 3-10 days even without treatment

Chronic tophaceous gout

If high uric acid is left untreated long-term, urate crystals can accumulate into lumps under the skin called tophi — found at joints, ears, or the Achilles tendon — causing permanent joint deformity and damage.

High Uric Acid Without Symptoms — Does It Need Treatment?

Many people discover high uric acid (hyperuricemia) during a routine health check-up, despite never having experienced a joint flare. Does it require immediate treatment?

What's a normal uric acid level?

Normal blood uric acid is generally around 3.5-7.2 mg/dL for men and 2.5-6.0 mg/dL for women. Levels above 6.8 mg/dL are considered at risk for crystallization.

No symptoms doesn't always mean medication is needed

If uric acid is high but there is no history of joint flares, no tophi, and normal kidney function, most doctors recommend lifestyle adjustments first — reducing high-purine foods, cutting alcohol, losing weight, staying well hydrated — with periodic monitoring of uric acid levels.

When medication may start even without symptoms

Doctors may consider starting urate-lowering therapy in specific cases, such as very high uric acid combined with kidney stones or high kidney disease risk — this should be evaluated individually with a doctor or pharmacist.

Foods to Avoid With Gout — High-Purine Foods

Foods high in purines are broken down directly into uric acid, making them a key trigger for gout flares.

Foods to avoid (very high purine)

  • Organ meats — liver, kidney, heart, brain
  • Certain seafood — sardines, anchovies, mussels, fish roe
  • Concentrated processed meats — cured meats and rich bone/meat broths
  • Alcohol — especially beer (contains purines and suppresses the kidneys' uric acid excretion)
  • High-fructose beverages — sodas, concentrated fruit juices

Foods to limit (moderate purine)

  • Red meat (pork, beef)
  • Salmon, tuna
  • Certain legumes (lentils, peas)
  • Mushrooms, asparagus, spinach (moderate purine but less risk than meat sources)

Foods generally fine (low purine)

  • Most vegetables and fruits (except those noted above)
  • Whole grains
  • Low-fat dairy products — studies show they may lower gout risk
  • Eggs
  • Coffee (does not increase risk; some studies suggest a slight protective effect)

Food Table: Safe, Limit, Avoid

Food categoryExamplesPurine levelGuidance
Organ meatsLiver, kidney, brainVery highAvoid
Certain seafoodSardines, anchovies, musselsVery highAvoid
AlcoholBeer, spiritsHighAvoid
Red meatPork, beefModerateLimit
Common sea fishSalmon, tunaModerateLimit
Certain legumes/vegLentils, mushrooms, asparagusModerateFine in moderation
Low-fat dairyLow-fat milk, yogurtLowFine as usual
Most produceMost vegetables/fruitsLowFine as usual

Two Phases of Gout Treatment — Acute vs Long-Term

Gout treatment is divided into two phases with distinctly different goals. Understanding this distinction matters because the medications used in each phase are not interchangeable and should not be mixed up.

Phase 1 — Managing the acute flare

Goal: reduce pain and inflammation as quickly as possible — not to lower blood uric acid levels. Medications used here include Colchicine, NSAIDs, or corticosteroids (at the physician's discretion).

Phase 2 — Long-term urate-lowering therapy

Goal: keep blood uric acid consistently within a safe range to prevent recurrent flares. The primary medication for this phase is Allopurinol, taken continuously every day long-term.

⚠️ Why the two phases should not be mixed up

During an acute flare, long-term urate-lowering therapy should not be started, because a rapid change in uric acid levels can cause urate crystals to shift, potentially worsening or prolonging the pain. It's best to wait until the inflammation settles (typically about 1-2 weeks) before starting urate-lowering therapy, under the guidance of a doctor or pharmacist.

Colchicine — Treating Acute Gout Flares

Colchicine is an anti-inflammatory medication that specifically targets urate-crystal-induced inflammation. It effectively relieves the pain and swelling of a gout flare, especially when started early, within the first 12-24 hours of symptom onset.

How it's used

  • Can be taken with or without food, per pharmacist guidance
  • Helps relieve symptoms within 12-24 hours
  • Used specifically during flare episodes — not intended for continuous long-term use without professional guidance

Precautions

Colchicine can cause gastrointestinal effects such as nausea or diarrhea if the dose is exceeded. Those with kidney or liver conditions should consult a pharmacist first to determine an appropriate dose.

📖 Read more: A Colchicine-based option for acute gout flares — Tolchicine — fast-acting

Long-Term Urate-Lowering Therapy (Allopurinol) — When to Start

Allopurinol is the most widely used long-term urate-lowering medication. It works by inhibiting the enzyme that produces uric acid in the body, steadily lowering blood uric acid levels and helping prevent recurrent gout flares long-term.

How it's used

  • Taken once daily, continuously, as directed by a pharmacist or doctor
  • Take with or immediately after food, with plenty of water to support uric acid excretion
  • This is a long-term, ongoing treatment — not a medication taken only when pain occurs

⚠️ Important precaution — should not be started during an acute flare

Standard gout treatment guidance advises against starting Allopurinol while a joint is actively inflamed, because a sudden shift in uric acid levels can cause urate crystals in the joint to mobilize, potentially worsening or prolonging the pain. If a flare is currently active, treat the inflammation first with Colchicine or NSAIDs, then start Allopurinol once symptoms have settled (typically about 1-2 weeks later), under the guidance of a doctor or pharmacist.

What if a flare happens while already taking it?

For those already on continuous Allopurinol, if a flare occurs, there is no need to stop the medication — Allopurinol can be continued as usual alongside acute flare treatment (Colchicine/NSAIDs). Consult a pharmacist or doctor to confirm the best approach for your situation.

💡 Read more: A long-term urate-lowering option — Allostar-100, Allopurinol 100mg

When to See a Doctor

Most gout flares can be managed with initial care, but certain signs warrant prompt medical attention:

  • ❗ Severe joint pain with high fever — may indicate joint infection requiring evaluation
  • Frequent flares within a single year — long-term management planning is needed
  • Lumps under the skin (tophi) at joints or ears
  • ❗ Chronic kidney disease or history of kidney stones combined with high uric acid
  • ❗ No improvement after 5-7 days of initial care
  • ❗ Pregnant, breastfeeding, or with complex underlying conditions, before starting any medication

If one or more apply, consult a doctor or pharmacist to plan care suited to your individual situation.

Frequently Asked Questions

Gout is caused by chronically high blood uric acid that crystallizes in the joints, triggering acute inflammation. The main causes are the body producing too much uric acid or the kidneys excreting too little — often linked to high-purine diets, alcohol, and excess weight.

Avoid high-purine foods such as organ meats (liver, kidney), certain seafood (sardines, anchovies, mussels), and alcohol, especially beer. Red meat and common sea fish can be eaten but should be limited.

If there's no history of joint flares, no tophi, and normal kidney function, medication usually isn't needed immediately. Lifestyle changes are recommended first — reducing high-purine foods, cutting alcohol, managing weight — with periodic monitoring by a doctor.

Colchicine relieves pain and swelling during an acute gout flare and acts quickly. Allopurinol lowers blood uric acid long-term to prevent recurrent flares and must be taken continuously every day. Each has a distinct role and is used at a different stage.

Because a rapid shift in uric acid levels can cause urate crystals in the joint to mobilize, potentially worsening or prolonging pain. It's best to wait until inflammation settles (about 1-2 weeks) before starting, under guidance from a doctor or pharmacist.

No need to stop — Allopurinol can be continued as usual alongside acute flare treatment such as Colchicine or NSAIDs. Consult a pharmacist or doctor to confirm the right approach.

A gout flare often improves on its own within 3-10 days even without treatment, but skipping treatment can mean longer, more severe pain. Chronic untreated high uric acid also risks permanent joint damage over time. Consult a pharmacist or doctor for symptom relief and prevention planning.

Yes, it helps — adequate hydration supports the kidneys in excreting uric acid through urine, reducing the chance of crystallization. Aim for 2-3 liters of water per day, combined with reducing high-purine foods and managing weight.

⚠️ Disclaimer

The information on this page is for general informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment from a qualified doctor or pharmacist. If you have any questions about your symptoms or medication, always consult a doctor or pharmacist first.

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