Millions of people around the world live daily with joint pain, stiffness and movement limitations without knowing exactly what name they suffer from. “My joints hurt: do I have arthritis or osteoarthritis?” It is one of the most frequently asked questions in rheumatology consultations.

The confusion is understandable: both words share a root, both affect the joints and both generate pain. However, they are different diseases with origins, mechanisms and treatments that do not always overlap.

The difference lies in the origin:

Osteoarthritis, also called osteoarthritis, is a degenerative disease of the articular cartilage. Over time—and under the influence of factors such as body weight, repeated use of certain joints, or genetic predisposition—the cartilage that cushions the contact between bones wears out. It is, in essence, a mechanical deterioration process.

Arthritis, on the other hand, is an inflammatory process. The immune system mistakenly attacks the synovial tissue that lines the joints, causing chronic inflammation that, if left untreated, can erode the bone and deform the joint. The best known form is rheumatoid arthritis, an autoimmune disease.

Who does it affect?

Osteoarthritis is much more prevalent and is closely linked to aging: it is estimated that more than 30% of people over 65 years of age suffer from it to some degree. Knees, hips, spine and finger joints are the most affected areas.

"It usually produces pain that most of the time is slow and progressive. We call it mechanical pain. It appears when using the hands and causes brief stiffness in the morning," explains Damián Duartes Noé, head of the Rheumatology service at the British Hospital, to the Spanish media La Vanguardia.

“Osteoarthritis appears as we grow,” he emphasizes.

Rheumatoid arthritis, for its part, can appear at any age—even in children, where it is called juvenile idiopathic arthritis—and affects women more frequently in a ratio of three to one compared to men. It does not discriminate by age and, unlike osteoarthritis, it is a systemic disease: it can affect organs beyond the joints.

Similar symptoms

Both conditions share joint pain, visible inflammation in some cases and limitation of movement. However, there are signs that allow us to differentiate them in practice. In rheumatoid arthritis, morning stiffness usually lasts more than an hour and improves with movement. In osteoarthritis, the stiffness is brief and the pain worsens precisely with the use of the joint throughout the day.

Another guiding sign is symmetry: rheumatoid arthritis tends to affect the same joints on both sides of the body - both hands, both wrists - while osteoarthritis can be asymmetric and depend on local factors such as a previous injury or accumulated physical effort on one side.

Diagnosis: the importance of not confusing them

The differential diagnosis requires a detailed medical history, physical examination and complementary tests: blood tests in search of inflammatory markers such as C-reactive protein or rheumatoid factor, and imaging studies such as x-rays or MRIs.

Confusing both diseases has practical consequences. Treating active rheumatoid arthritis only with painkillers—as would be done in osteoarthritis—allows inflammation to continue damaging joint tissue uncontrollably. Conversely, subjecting a patient with osteoarthritis to unnecessary immunosuppressants carries risks without real benefit.

Treatment perspective

Advances in rheumatology have transformed the prognosis of arthritis. Biologic drugs and kinase inhibitors have allowed many patients to achieve disease remission. In osteoarthritis, although there is still no treatment that reverses cartilage wear, physiotherapy, weight control and, in advanced cases, joint replacement surgery offer a significant improvement in quality of life.

Knowing well what disease you are dealing with is the first step in choosing the correct therapeutic path. And that path always begins with an accurate diagnosis.

How to gain strength in your hands

Duartes Noé warns that from the age of 45 we begin to lose muscle mass. “If this happens in the hands and we add a little osteoarthritis, they will have less strength and ability,” he points out.

"In the office we teach patients to do some exercises to contract them and also to elongate them. Because if I only do exercises to tighten, I am only strengthening the grip part. And I also need to stretch those tendons," explains the rheumatologist.

While at home exercises are recommended to achieve hand strength and range of motion. For example, grab a soft tennis ball, “that is punctured, and squeeze and release it several times.”

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