Age at which the condition starts

It may begin any time in life.

It usually begins later in life.

Speed of onset

Relatively rapid, over weeks to months

Slow, over years

Joint symptoms

Joints are painful, swollen, and stiff.

Joints ache and may be tender but have little or no swelling.

Pattern of joints that are affected

It often affects small and large joints on both sides of the body (symmetrical), such as both hands, both wrists or elbows, or the balls of both feet.

Symptoms often begin on one side of the body and may spread to the other side. Symptoms begin gradually and are often limited to one set of joints, usually the finger joints closest to the fingernails or the thumbs, large weight-bearing joints (hips, knees), or the spine.

Duration of morning stiffness

Morning stiffness usually lasts longer than 1 hour.

Morning stiffness usually lasts less than 1 hour. Stiffness returns at the end of the day or after periods of activity.

Presence of symptoms affecting the whole body (systemic)

Frequent fatigue and a general feeling of being ill are present.

Whole-body symptoms are not present.