Source:http://linkedlifedata.com/resource/umls/id/C0032708
CSP: group of disorders characterized by the excessive production of porphyrins or their precursors that arises from abnormalities in the regulation of the porphyrin-heme pathway; acquired porphyrias, which are due to inhibition of enzymes in the metabolic pathway by a drug, toxin or abnormal metabolite, are more common than those which are inherited.,MEDLINEPLUS: <p>Porphyrias are a group of genetic disorders caused by problems with how your body makes a substance called heme. Heme is found throughout the body, especially in your blood and bone marrow, where it carries oxygen. </p><p>Porphyrias affect the skin or the nervous system. People with the skin type develop blisters, itching, and swelling of their skin when it is exposed to sunlight. The nervous system type is called acute porphyria. Symptoms include pain in the chest or abdomen, vomiting, and diarrhea or constipation. During an attack, symptoms can include muscle numbness, tingling, paralysis, cramping, and personality or mental changes. Certain tr