Inclusion Criteria:  Man or woman aged 18 to 60; Presenting severe abdominal pain, afebrile and diffuse over several days, evolving for less than 5 years;  With at least one of the following symptoms:  Peripheral neurological symptoms: decreased driving force and pain in the limbs (roots of the thighs), etc. ; Central neurological symptoms: psychiatric (depression, anxiety, insomnia), disturbances of consciousness, etc. ; Autonomous neurological symptoms: tachycardia, nausea, vomiting, constipation, etc. With a first negative etiological assessment requested by an emergency physician, gastroenterologist, gynecologist, neurologist, internist or another specialty, or with a diagnosis of acute hepatic porphyria less than 6 months; Patient able to understand the information related to the study and having indicated his non-objection to the collection of data concerning him;  Exclusion Criteria:  Patient with a diagnosis of acute hepatic porphyria for more than 6 months; Patient unfit to participate in the study, due to cognitive or linguistic difficulties; Protected patient (under legal protection, or deprived of liberty by judicial or administrative decision).