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A variety of factors -- ranging from emotional stress and trauma to streptococcal infection -- can cause an episode of psoriasis. Recent research indicates that some abnormality in the immune system is the key cause of psoriasis.
Stress and itch. Stress is a common trigger for a psoriasis flare. Stress also can make itch worse. This makes managing stress a particularly important life skill for people with psoriasis. Consider the following ways some people with psoriasis and psoriatic arthritis are effectively reducing stress in their lives.