Nepedia
Back to Discover
Fluent Reader
🧬

Arthritis

life science Maturity 11-13 Vital Level 3 Next article →

Arthritis is a general name for many joint problems.

Osteoarthritis in the left hand index finger
Osteoarthritis in the left hand index finger

A joint is where two bones meet. These joints have a smooth layer called cartilage. This layer protects the bones from rubbing together. In arthritis, this smooth layer is lost. This causes bone to grind on bone during movement. This can lead to pain and stiffness. Other signs include redness, warmth, and swelling. Some people may even find it hard to move their joints.

Varus Knee Osteoarthritis Xray
Varus Knee Osteoarthritis Xray

There are many ways arthritis happens. In osteoarthritis, the cartilage breaks down from wear and tear. This often happens in joints that carry weight, like hips or knees. It can also affect fingers and shoulders. In rheumatoid arthritis, the body's immune system makes a mistake. The immune system usually protects us from germs. In this case, it attacks the lining of the joint. This causes swelling and inflammation.

X-ray of right fourth PIP joint with bone erosions by rheumatoid arthritis
X-ray of right fourth PIP joint with bone erosions by rheumatoid arthritis

Another kind is called gout. Gout happens when too much uric acid builds up in the body. This creates tiny crystals in the joints. These crystals often settle in the big toe.

Gout Signs and Symptoms
Gout Signs and Symptoms

Doctors use different tools to study these conditions. They may use X-rays to see the bones. X-rays can show if the space between bones has become narrow. They can also show bone spurs. For rheumatoid arthritis, doctors might use blood tests. These tests look for specific markers of inflammation. They might also use CT scans or PET scans. These help doctors see more detail inside the body. A doctor will also look at how a person walks. They might check the skin for any rashes.

Lupusfoto
Lupusfoto

Many people around the world live with arthritis. In the United States, more than 20% of people have it. In Australia, about 15% of people are affected. Osteoarthritis is the most common form. It affects more than 3.8% of people. Rheumatoid arthritis is the second most common. It affects about 0.24% of people. Some diseases like lupus can also cause joint pain. About 90% of people with lupus have joint involvement. Arthritis often becomes more common as people get older.

Living with arthritis can change daily life. It can make it hard to do work or play. People might feel tired or have trouble sleeping. Some types can even affect other parts of the body. For example, lupus can cause hair loss or skin rashes. To help with pain, people might rest their joints. They might use heat or ice. Losing weight can also help reduce pressure on joints. Doctors may also give medicine to help with swelling. In very severe cases, a person might need joint replacement surgery.

432 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

🖼️ Images & Media (5)
File:Osteoarthritis in the left hand index finger.jpg
Osteoarthritis in the left hand index finger.jpg
File:Varus Knee Osteoarthritis Xray.jpg
Varus Knee Osteoarthritis Xray.jpg
File:X-ray of right fourth PIP joint with bone erosions by rheumatoid arthritis.jpg
X-ray of right fourth PIP joint with bone...
File:Lupusfoto.jpg
Lupusfoto.jpg
File:Gout Signs and Symptoms.jpg
Gout Signs and Symptoms.jpg
More to explore

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.