Patients may develop autonomic neuropathies, such as hypertension and tachycardia. Patients may have very severe abdominal pain lasting several days.
The predominant problem appears to be neurologic damage that leads to peripheral and autonomic neuropathies and psychiatric manifestations.  Although levels of porphobilinogen
The neurovisceral symptoms consist of autonomic neuropathies (eg, constipation, colicky abdominal pain, vomiting, hypertension), peripheral neuropathy, seizures, delirium,