A 17-year-old boy presents to the emergency department with severe abdominal pain. Laboratory tests show a deficit in uroporphyrinogen I synthetase and excess δ-aminolevulinate and porphobilinogen in the urine. Which of the following symptoms would most likely also be
present in this patient?
(A) Chest pain
(C) Neuropsychiatric disturbances
(E) Stiff neck