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Porphyria is a rare, usually inherited, metabolic disorder.
It is not a single disease, but a group of at least eight disorders. Unlike some genetic diseases, the symptoms do not usually point to the disease. When they do accumulate, they become toxic and result in turning into different types of porphyria. It is almost impossible to make general statements that apply to porphyria. Diagnosis is often delayed because the symptoms are so general.