Stress

Psoriasis has been determined to be genetically based (i.e. it can't be contracted by coming in contact with someone who has it) and stress has been identified as a trigger. These stressors can vary from person to person and can be anything from a negative (personal or financial problems) to a positive (marriage or birth of a child). Your body's coping mechanisms to stress triggers a response from the immune system that prompts the over-reaction and increased rate of cell maturation. The skin cells develop faster (in about four days as opposed to almost a month) and pile up on the surface because they don't have time to shed off as they would normally.

Alcohol, Smoking & Medications

Other potential psoriasis triggers include: smoking, alcohol and medications. Besides being triggers, smoking can further aggravate psoriasis while alcohol can limit the effects of a psoriasis treatment. Some medications such as anti-malarial drugs, Beta Blockers (used for high blood pressure) and Indomethacin (a non-steroid medication used for arthritis) have been found to trigger psoriasis outbreaks. In some cases, if you abruptly stop taking a medication it can trigger a psoriasis flare-up.

Seasonal

Many people notice a seasonal fluctuation with their psoriasis. You may find that it improves during the spring and summer months and gets worse during the winter. While it has not been verified, it is believed that the increased exposure to natural ultraviolet light obtained from spending more time in the sun helps. Be mindful of overexposure as it can trigger a flare-up and always be sure to use sunscreen to avoid sunburn which can also result in a flare-up as well as damage to the skin in general.

The winter can have a negative effect on psoriasis due to the increased dryness in the air, reduced amount of sunlight as well as the greater likelihood of your getting sick. Anything that affects your immune system is likely to trigger a flare-up. Be cautious in running out to get a flu shot as vaccinations along with sunburns and scratches can all trigger a response that is known as the Koebner Response. This is where the skin has been injured or traumatized and reacts with an outbreak of psoriasis.