Initial symptoms of acute intermittent porphyria include:

• Abdominal pain
• Constipation
• Nausea
• Rapid heart rate at rest
• Vomiting
• Weakness or fatigue

Additional psychiatric symptoms of acute intermittent porphyria include:

• Delusions:
• Unrealistic ideas
• Unrealistic plans
• Hallucinations:
• False perception of something that does not exist
• Visual hallucinations: seeing things that do not exist
• Auditory hallucinations: hearing sounds or voices that do not exist
• Depression

Additional neurologic symptoms of acute intermittent porphyria include:

• Muscle aches
• Arm weakness (bilateral)
• Leg weakness (bilateral)
• Seizures
• Confusion