Sitting in the sun can help you get healthy doses of vitamin D. But it seems some people with a certain form of arthritis are not getting enough of the sun's rays.

Two recently published studies on Psoriatic Arthritis reveals new insights on environmental conditions that may affect the development of the autoimmune disease.

The right levels of major vitamins are important for your good health. Many medical conditions, such as psoriasis, can send those vitamin levels plummeting.