Study links aging and smoking to rising rheumatoid arthritis

Rheumatoid arthritis, which causes joint pain and swelling, is becoming more common worldwide.

Scientists used a computer to study the disease from 1980 to 2021.

They found that more elderly people and increased smoking are two main reasons for the rise in cases.

Although the disease is increasing globally, it is becoming more unequal across the world.

Some countries with early detection programs, better treatments, and diets may have lower impact from the disease.

If people quit smoking, this could help reduce deaths and suffering.

The research suggests that more health policies are needed to help regions with the most need.