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  1. Porphyria - Symptoms and causes - Mayo Clinic

    • Porphyria (por-FEAR-e-uh) refers to a group of rare disorders that result from a buildup of natural chemicals called porphyrins in the body. Porphyrins are needed to make heme, a part of hemoglobin. Hemogl… 展开

    Symptoms

    Symptoms can vary widely by type of porphyria and in how severe the symptoms are. Symptoms also can vary among people with the condition. Some people with a gene chan… 展开

    Mayo Clinic
    Causes

    All types of porphyria involve a problem making heme. Heme is a part of hemoglobin. Hemoglobin is the protein in red blood cells that carries oxygen from the lungs to all parts … 展开

    Mayo Clinic
    Risk Factors

    In addition to genetic risk factors, environmental risk factors may trigger symptoms in porphyria. When exposed to the trigger, the body's demand for heme production incre… 展开

    Mayo Clinic