In recent years, psoriasis occurs frequently and brings great trouble to people. Therefore, we should understand what are the common causes of psoriasis and pay attention to prevention. Experts pointed out that: psoriasis onset is affected by many factors, in general, the main classification of internal causes, as well as external causes of two parts. The following is a detailed introduction for you, I hope you pay attention to prevention. The reasons of inducing psoriasis are as follows: 1, traumatic infection is an important factor inducing the onset of psoriasis, especially after the patient catches a cold, complicating tonsillitis, bronchitis and so on, which is very easy to lead to the aggravation of the condition of psoriasis or the recurrence of psoriasis, and it is necessary to treat it positively and shorten the course of the disease as much as possible. 2, psoriasis patients with excessive mental tension, easy to cause emotional instability, worry and depression, which leads to the onset and recurrence of the disease. Research has found that excessive mental tension, impatient temperament, depression and other mental factors are also very likely to lead to the onset or recurrence of psoriasis. 3.Skin allergy is also an important reason to induce psoriasis, patients due to diet or taking drugs, or contact with some kind of material and allergy can often induce the occurrence of the disease. The above reasons are not for all people, psoriasis patients have great individual differences, each patient has psoriasis for different reasons. Warm tips: psoriasis is a very stubborn disease, the symptoms of skin lesions spread faster, the treatment is difficult. Patients must go to a regular dermatology hospital for treatment in the early stages of the disease.