While the underlying cause of psoriasis stems from your body’s immune system, certain triggers can make symptoms worse or cause flare-ups. These psoriasis triggers include:
Cold and dry weather. Such weather can dry out your skin, which makes the chances of having a flare-up worse. In contrast, hot, sunny weather appears to help control the symptoms of psoriasis in most people.
Stress. Having psoriasis can itself cause stress, and patients often report that outbreaks of symptoms come during particularly stressful times.
Some medications. Certain drugs, such as lithium (a common treatment for bipolar disorder), drugs for malaria, and some beta-blockers (used to treat high blood pressure, heart disease, and some heart arrhythmias), can cause flare-ups of psoriasis symptoms.
Infections. Certain infections, such as strep throat or tonsillitis, can result in guttate (small, salmon-pink droplets) or other types of psoriasis two to three weeks after the infection. Psoriasis symptoms may worsen in people who have HIV.
Trauma to the skin. In some people with psoriasis, trauma to the skin — including cuts, bruises, burns, bumps, vaccinations, tattoos, and other skin conditions — can cause a flare-up of psoriasis symptoms at the site of the injury. This condition is called “Koebner phenomenon.”
Alcohol. Using alcohol may increase the chances of psoriasis flare-ups, at least in men.
Smoking. Some experts think that smoking can worsen psoriasis symptoms.
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