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Hartnup disorder Causes and Risks: Hartnup disorder is possibly the most common metabolic condition involving amino acids . Although most people show no symptoms, photosensitivity is the major symptom, and ataxia and mood changes often appear together. The incidence is 3 out of 100,000 people. Prevention: There is no known prevention for this rare inherited condition. Symptoms: Signs and Tests: Treatment: A high protein diet is recommended. Supplements with nicotinic acid may be recommended. Prognosis: People with this disorder can expect a normal lifespan with no disability. Complications: There are usually no complications. Call Your Healthcare Provider: Call for an appointment with your health care provider if you have or observe signs or symptoms or have a family history of this condition.
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