There is a strong genetic risk for psoriatic arthritis. Such, genetic risk factors along with exposure to various environmental triggers leads to psoriatic arthritis. Prior infections, trauma, and stress are some of the other triggers. Dysregulation of gut microbiome is thought to be a risk factor. The microbiome is the aggregate of all the bacterias that reside in different parts of our body, including gut and the skin. A symbiotic relationship between these microbiota and other bacteria influences the immune system function. A dysregulation of this process could increase your risk of psoriasis and psoriatic arthritis. Diet is thought to play a key role in causing such dysregulation, suggesting the important role of diet on this disease.