Psoriatic arthritis is what people call “psoriatic arthritis”. Generally, if a person with psoriasis has symptoms such as joint pain and swelling, he or she should first consider whether or not they have psoriatic arthritis. Of course, there are some people who have joint swelling and pain, deformities and other discomfort first, and only after a period of time or a long time do psoriasis begin to appear, then psoriatic arthritis should also be ruled out. With psoriatic arthritis, not only will the skin appear red and even silvery-white scales, affecting personal image, but also joint pain, swelling and deformity, which will have a certain impact on the psychological and physical health of the patient. 1, the prevalence of psoriatic arthritis in countries around the world The age of prevalence of psoriatic arthritis is 30-55 years old, the prevalence of men and women is similar and can be seen around the world, but the prevalence of psoriatic arthritis varies greatly by race, and the precise prevalence is not yet clear. The prevalence of psoriatic arthritis has been reported, ranging from 0.04% to 1.4%, possibly due to differences in the diagnosis and definition of psoriatic arthritis. A survey by the National Psoriasis Foundation showed a prevalence of psoriatic arthritis of 1.5%. In a retrospective cross-sectional study, the highest prevalence of psoriatic arthritis was found in the United States, with approximately 420 per 100,000 people, compared with approximately 20 per 100,000 people in the European population. The prevalence of psoriatic arthritis is lower in Asian countries, and demographic research shows that there are relatively few Japanese people suffering from psoriatic arthritis, with only 0.1-1 people in 100,000 people suffering from psoriatic arthritis. According to the population statistics, there are about 130,000-1.3 million patients with psoriatic arthritis. 2, the incidence of psoriatic arthritis in psoriasis There is a great correlation between the prevalence of psoriasis and arthritis. The prevalence of arthritis in the general population is about 2%-3%, while the prevalence in patients with psoriasis is as high as 7%-42%; on the contrary, the prevalence of psoriasis in patients with arthritis is 2.6%-7%, while the prevalence in the general population is 0.1%-2.8%. Epidemiological surveys show that among psoriasis patients, the prevalence of psoriatic arthritis ranges from 6% to 42% in Europe, the United States, and South Africa, and a contemporary study of 180 Italian psoriasis patients found a 34% prevalence of arthritis. A study of 1258 American patients with psoriasis found that approximately 40% had arthralgia and 20% had psoriatic arthritis. Because these data are from patients treated with PUVA, the prevalence of arthritis may be too high. However, these patients had severe psoriasis, which may be associated with arthritis. In Asian countries, the prevalence of psoriatic arthritis in psoriasis is lower, at 9% (Iran, Korea, India), 2% (Turkey), and 1% (Japan). In China, the incidence of psoriatic arthritis in psoriasis is 5.7%, and the trend is rising. 3, psoriatic arthritis has family heritability It is worth noting that psoriatic arthritis also has family aggregation. Family surveys have found that first-degree relatives of patients with psoriatic arthritis are more likely to develop psoriatic arthritis than the general population or their spouses. Demographic studies have shown that the likelihood of psoriasis occurring in children of parents with psoriasis is 41%, the likelihood of children of one parent having the disease is 14%, the likelihood of siblings having the disease is 6%, and the likelihood of parents and siblings not having the disease is 2%. 4, psoriatic arthritis should be treated early psoriatic arthritis is a systemic disease, more prone to hypertension, diabetes, cardiovascular disease, hyperlipidemia and other diseases than normal people, and can not be cured, but if early detection, early intervention and adhere to long-term standardized treatment, can effectively relieve the symptoms, so as to avoid serious complications. Early intervention of psoriatic arthritis refers to the treatment of psoriasis patients who are likely to develop psoriatic arthritis when they do not have joint symptoms or only have mild joint pain in the early stage, and mainly adopts Chinese medicine treatment methods to prevent or delay the appearance of joint symptoms, prevent complications, improve the prognosis and enhance the quality of patients’ survival. Director Huang also believes that most patients with psoriatic arthritis suffer from anxiety and depression, and surveys show that the prevalence of moderate to severe depressive symptoms is 21.7% among patients with psoriasis, including 36.7% among patients with polyarthritic manifestations. He stressed that psoriatic arthritis is not contagious and that patients need the care of all sectors of society.