Definition

What Is Arthritis?

Choose a preferred language

Arthritis is a disease that causes inflammation in the joints. Joints are the parts where bones meet and move. Arthritis can affect any joint in your body. There are more than 100 types of arthritis. They include: 

  • Osteoarthritis

  • Rheumatoid arthritis

  • Gout

  • Lupus

If your symptoms are mild, medicines may be enough to ease pain and swelling. For more severe arthritis, you may need surgery. This can improve the condition of the joint. Or it can replace part or all of the joint.


What causes arthritis?

Cartilage is a smooth substance that protects the ends of your bones and provides cushioning. When you have arthritis, this cartilage breaks down and can no longer protect your bones. This can happen from an autoimmune disease. Or it can happen from wear and tear, infections, or injury. The bones rub against each other, causing pain and swelling. Over time, small pieces of rough or splintered bone (bone spurs) may develop. The joint's range of motion can become limited.

Front view of knee joint.Front view of knee joint showing inflammation and arthritis.


Symptoms

Some of the more common symptoms of arthritis include:

  • Joint pain and stiffness. These symptoms get worse with long periods of rest. They may also get worse from using a joint too long or too hard.

  • Loss of normal shape and motion. Joints may look swollen and be hard to move.

  • Sore, inflamed joints. They may look red and feel warm.

  • Grinding or popping noise. This happens with joint movement.

  • Severe tiredness (fatigue). You may feel tired all the time.


Reducing symptoms

You can help ease symptoms in these ways:

  • Losing weight

  • Exercising on a regular basis

  • Strengthening muscles around the joint to reduce the strain on the joint

  • Using hot and cold packs on your joints

  • Using over-the-counter and prescription medicines

Talk with your healthcare provider about the best treatments for your condition.

© 2000-2026 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.

Make an Appointment

Make an Appointment

Find a Doctor

Find a Doctor

Find a Location

Find a Location

Related Services

Orthopedics Center

Related Articles
Read article
Orthopedics
What Is Basal Joint Arthritis?

Basal joint arthritis often affects the joint at the base of the thumb, the basal joint.

Read article
Orthopedics
Anatomy of the Spine

Your backbone, also called the vertebral column, is made up of 33 vertebrae separated by spongy disks.

Read article
Orthopedics
Sacroiliitis

Sacroiliitis is when one or both sacroiliac joints are hurt or inflamed. It can make small movements of the lower back and pelvis very painful. Learn how to care for yourself at home.

Read article
Orthopedics
Common Types of Fractures

Bones anywhere in the body can break. Casts are often used for fractures in the hands, arms, legs, or feet. There are many types of fractures. But all fractures heal the same way: New bone grows to connect the broken pieces. A cast holds broken bones in place while they heal.