3. Stress is a major contributor
Stress is the number one trigger, says Dr. Gooderham, because psoriasis is believed to be an immune system problem. Addis was diagnosed with the condition shortly after the birth of her daughter and says that stress was a big factor for her. She says her psoriasis was at its worse during that stressful time in her life. Other contributing factors include local injury to skin, systematic infections and the use of certain medications.