Becoming pregnant when you've got arthritis can affect your body in several ways. You may find that your joints are less stable and "looser." The additional weight may increase symptoms of osteoarthritis to the knee. Your back tends to sway in response to the additional weight of the baby, so back pain, muscle spasms, or numbness and tingling in your legs can occur. An increase in water weight can increase stiffness in the hips, knees, and ankles (the weight-bearing joints) and can worsen carpal tunnel syndrome.

On the bright side, some forms of arthritis seem to improve during pregnancy. Rheumatoid arthritis, for example, often improves before the beginning of the fifth month, with a decrease in joint swelling. Sometimes lupus and scleroderma improve as well. However, you may experience a flare soon after the birth of the baby.

See both an obstetrician and a rheumatologist during the course of your pregnancy. You should also continue to take your arthritis medicines (if advised to do so by your doctors); exercise to keep your weight under control, your joints flexible, and your muscles strong; follow a nutritious eating plan; observe the rules of joint protection; and use stress management techniques to control mood swings and encourage relaxation.