Quick answer: Arthritis is an umbrella term for over 100 conditions that affect the joints and surrounding tissues, most often causing pain, stiffness, and swelling. According to the CDC’s Arthritis Basics (reviewed 2024–2025), arthritis describes disorders of the joints and nearby connective tissues rather than a single disease.
What is arthritis?
When people ask “what is arthritis,” they’re often expecting one diagnosis.
In reality, arthritis is a family of conditions that affect where bones meet—your joints—and the tissues around them. Common symptoms are joint pain, stiffness (especially after rest or in the morning), swelling, and reduced range of motion. Some types also bring warmth, redness, fatigue, or whole‑body symptoms.
The CDC describes arthritis as conditions of the joints and surrounding tissues, with more than 100 types under this umbrella in the United States and worldwide, as summarized in its Arthritis Basics overview.
What does arthritis feel like?
People often describe a deep, aching pain in one or more joints.
Stiffness can feel like a tight band that softens once you start moving. Swelling may make a joint look puffy, tender, warm, or even red during a flare. Range of motion can shrink—you might struggle to fully bend a knee or make a fist.
With autoimmune types such as rheumatoid or psoriatic arthritis, fatigue can be striking, as if your energy “falls through the floor.” Morning stiffness may last longer than 30–60 minutes and ease with gentle activity.
These experiences are consistent with consumer guidance from the CDC and NIAMS on common arthritis symptoms, including the patterns seen in osteoarthritis and inflammatory types like RA and psoriatic arthritis; see the CDC’s Osteoarthritis page and Rheumatoid Arthritis page, and NIAMS’ Psoriatic Arthritis overview.
Common types of arthritis
While there are many forms, four types come up most for beginners: osteoarthritis (OA), rheumatoid arthritis (RA), gout, and psoriatic arthritis (PsA). Juvenile arthritis affects children and teens and is covered by NIAMS.
| Type | Main cause or mechanism | Hallmark symptoms | Typical tests | First-line management (consumer level) |
|---|---|---|---|---|
| Osteoarthritis (OA) | Cartilage wear and joint remodeling over time; prior injury/overuse raise risk | Pain and stiffness, often worse with activity; knees, hips, hands common | X‑rays show joint space loss/osteophytes | Low‑impact activity, weight management, OTC pain relievers/NSAIDs as appropriate — per CDC OA overview |
| Rheumatoid arthritis (RA) | Autoimmune attack on joint lining (synovium) | Symmetric small‑joint pain/swelling; morning stiffness; fatigue | RF, anti‑CCP/ACPA, ESR/CRP; X‑ray/ultrasound/MRI | Disease‑modifying drugs (DMARDs), biologics, or JAK inhibitors as directed by a clinician; NSAIDs or short steroid courses for symptoms; movement and self‑management — per Mayo Clinic RA treatment and CDC RA |
| Gout | Uric acid crystals deposit in joints | Sudden, severe pain, redness, swelling—often big toe | Joint fluid analysis to confirm crystals; serum uric acid supportive | Anti‑inflammatories for flares; urate‑lowering therapy to prevent recurrences; diet/alcohol moderation — per CDC Gout |
| Psoriatic arthritis (PsA) | Immune‑mediated arthritis linked to psoriasis | Joint pain/swelling; sausage‑like fingers/toes (dactylitis); nail changes; heel pain | Clinical exam; imaging; often RF negative; fluid analysis may rule out gout | NSAIDs; DMARDs/biologics/JAK inhibitors; skin care for psoriasis; exercise — per NIAMS PsA overview and Mayo Clinic PsA care |
NIAMS also provides an overview of juvenile arthritis, which covers several conditions affecting children and teens; see NIAMS Juvenile Arthritis.
What causes arthritis?
Causes vary by type.
In osteoarthritis, gradual cartilage wear and joint changes play a central role; risk rises with age, prior joint injuries, repetitive stress at work or sport, and excess body weight. Rheumatoid arthritis is autoimmune: the immune system mistakenly targets joint lining, with risks that include age, being female, smoking, certain genes, and environmental influences. Gout occurs when high uric acid allows sharp crystals to form in a joint; obesity, some medications (like certain diuretics), diets high in purines, sugary drinks, alcohol, and kidney or heart conditions raise risk. Psoriatic arthritis combines genetic susceptibility with immune triggers linked to psoriasis.
For clear consumer summaries, see the CDC’s OA overview, RA overview, Gout page, and NIAMS’ PsA page.
Is arthritis hereditary? Family history does raise risk for some types (for example, RA and psoriatic disease), but genes aren’t destiny—environment and lifestyle also play roles. See the CDC’s RA overview and NIAMS’ PsA page for consumer explanations.
How is arthritis diagnosed?
Diagnosis starts with your story and a hands‑on exam.
Clinicians look at which joints hurt, when symptoms started, morning stiffness, flares, function, and any skin/nail changes. Depending on the suspected type, tests may include blood tests for inflammation or autoantibodies (ESR/CRP; rheumatoid factor and anti‑CCP/ACPA for RA), uric acid levels (supportive for gout), imaging such as X‑rays (structure/damage) and ultrasound or MRI (early inflammation), and sometimes joint fluid analysis (aspiration) to confirm uric acid crystals or rule out infection.
A concise consumer overview of diagnostic tools appears in Mayo Clinic’s RA diagnosis and treatment page.
How is arthritis treated?
Treatment depends on the type and severity.
Broadly, it includes symptom relief, disease control (for autoimmune types), movement and weight strategies, and sometimes procedures. Over‑the‑counter NSAIDs (such as ibuprofen or naproxen sodium) can reduce pain and inflammation; acetaminophen can help pain but not inflammation. Use as directed and talk with a clinician or pharmacist about interactions and risks. The Arthritis Foundation’s drug guides outline consumer‑level considerations for ibuprofen, naproxen sodium, and acetaminophen. For rheumatoid and psoriatic arthritis, doctors often use disease‑modifying drugs (DMARDs), biologics, or JAK inhibitors to control inflammation and prevent joint damage — these require medical supervision, monitoring, and individualized plans, per Mayo Clinic’s RA treatment overview. Corticosteroid pills or injections may calm flares but aren’t a long‑term stand‑alone plan. Beyond medicines, the CDC recommends joint‑friendly physical activity (walking, cycling, swimming, tai chi), weight management, and participation in evidence‑based programs such as Walk With Ease or the Chronic Disease Self‑Management Program; see CDC prevention and physical activity guidance and CDC self‑care resources.
Assistive devices (cane, jar openers, braces) can protect joints, and in severe damage—often in advanced OA or long‑standing inflammatory disease—surgery such as joint replacement may be considered after specialist evaluation.
Stages of rheumatoid arthritis — what people mean and how doctors really track it
You’ll see searches for “what are the 4 stages of rheumatoid arthritis.” Older materials sometimes describe radiographic “stages” based on joint damage seen on X‑rays. Modern practice focuses less on a fixed four‑stage ladder and more on measuring disease activity (how inflamed you are now) and tracking joint damage over time to guide “treat‑to‑target” care (aiming for remission or low disease activity).
Consumer pages from the CDC and Arthritis Foundation emphasize ongoing monitoring and medication adjustment rather than a universal stage count; see the CDC’s RA overview and the Arthritis Foundation’s DMARDs fact sheet (2025).
How to prevent or reduce your risk
Not every type is preventable, but several habits lower risk and improve symptoms. Stay active most days with joint‑friendly movement and build up gradually. Work toward a healthy weight to reduce load on weight‑bearing joints. Protect your joints by avoiding repetitive strain and using supportive gear and proper technique at work and during activities. Don’t smoke; smoking raises risk for RA and worsens outcomes. Manage conditions like diabetes and high blood pressure. If you have gout, ask about urate‑lowering therapy and discuss nutrition patterns (for example, cutting back on alcohol and sugar‑sweetened drinks).
These themes align with the CDC’s self‑care and prevention guidance.
What to take for arthritis?
What to take depends on your arthritis type and overall health.
For many, OTC options can help symptoms. NSAIDs (ibuprofen, naproxen sodium, aspirin) reduce pain and inflammation — don’t combine multiple NSAIDs, and use the lowest effective dose for the shortest time; see the Arthritis Foundation’s consumer guides for ibuprofen and naproxen sodium. Acetaminophen eases pain but not inflammation; stay within labeled daily limits and watch for acetaminophen in other products; see the Foundation’s acetaminophen overview. Prescription medicines (DMARDs, biologics, JAK inhibitors, urate‑lowering therapy) should be started and monitored by a clinician.
Be cautious with supplements marketed for arthritis pain: the U.S. FDA has warned about some “arthritis” products containing hidden drugs; see the FDA’s medication health fraud alerts.
When to see a doctor and safety reminders
New joint swelling with warmth or redness — especially with fever — needs prompt medical attention. Sudden, severe pain in a single joint (like the big toe) may be gout or, rarely, an infection; urgent evaluation helps protect the joint.
Morning stiffness lasting more than an hour, symmetric hand or foot swelling, or marked fatigue could suggest inflammatory arthritis — ask about a referral to a rheumatologist. If you’re on immunosuppressive therapy for autoimmune arthritis, discuss vaccines and infection prevention with your care team; Mayo Clinic’s RA treatment overview offers general consumer guidance.
FAQ
What is rheumatoid arthritis?
It’s an autoimmune type of arthritis where the immune system attacks the joint lining, causing pain, swelling, stiffness, and potential damage; see the CDC’s RA overview.
What does arthritis feel like?
Deep, aching joint pain with stiffness after rest; swelling and warmth during flares; sometimes fatigue — consistent with CDC and NIAMS symptom descriptions in the sections above.
What are the 4 stages of rheumatoid arthritis?
A strict four‑stage system isn’t emphasized in current consumer materials; clinicians monitor disease activity and joint changes to tailor treatment, as noted by the CDC’s RA overview and the Arthritis Foundation’s DMARDs fact sheet.
How to prevent arthritis?
Not all types are preventable, but joint‑friendly activity, weight management, injury prevention, and not smoking can lower risk and improve outcomes, per CDC prevention guidance.
Is arthritis hereditary?
Family history raises risk for some types (like RA and psoriatic disease), but genes interact with environment and lifestyle; see CDC RA and NIAMS PsA.
What to take for arthritis?
OTC NSAIDs or acetaminophen may help symptoms; choice depends on your health profile and arthritis type. For autoimmune types or frequent gout attacks, prescription therapy is often needed under clinician care. Consumer drug guides: Arthritis Foundation pages linked above.
References
- Centers for Disease Control and Prevention (CDC) — https://www.cdc.gov/arthritis/basics/index.html; https://www.cdc.gov/arthritis/rheumatoid-arthritis/index.html; Gout; https://www.cdc.gov/arthritis/prevention/index.html; https://www.cdc.gov/arthritis/caring/index.html
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) — https://www.niams.nih.gov/health-topics/psoriatic-arthritis; https://www.niams.nih.gov/health-topics/juvenile-arthritis
- Mayo Clinic https://www.mayoclinic.org/diseases-conditions/rheumatoid-arthritis/diagnosis-treatment/drc-20353653;https://www.mayoclinic.org/diseases-conditions/psoriatic-arthritis/diagnosis-treatment/drc-20354081
- Arthritis Foundation —https://www.arthritis.org/getmedia/3950352d-f56f-4c95-8753-852df73948dd/Fact-Sheet-DMARDs-100825.pdf ; Drug Guide entries for ibuprofen, naproxen sodium, and acetaminophen (linked inline above)
