section_path: Personal life/Health
section_name: Health
paragraph_text: Health
  
  Duterte has Buerger's disease, an inflammation of blood vessels, mostly in the limbs, and Barrett's esophagus, wherein esophageal cells are gradually replaced by gastrointestinal cells. He has denied rumors of throat cancer.
  
  Duterte admitted in December 2016 that he had been a user of the addictive opioid drug Fentanyl. He said that a doctor prescribed the drug to alleviate back pain and headaches, but that he would take more than he was prescribed. Duterte later denied that he was a drug addict, and a spokesman stated that he was not affected by side-effects of the drug, which include confusion, anxiety, and hallucinations.
  
  Duterte has boasted about his use of Viagra: "When I was young, I could do overnight, which is more expensive. When I got old, I could do short time only because I have such a short time left. After one erection, that's it. No more. Without Viagra, it's even more difficult."
  
  A psychological assessment of Duterte was commissioned by a doctor named Natividad Dayan during Duterte's marriage annulment to Elizabeth Zimmerman in July 1998. The result was that Duterte (then Davao City mayor) was found to have " antisocial narcissistic personality disorder", exemplified by "gross indifference, insensitivity and self-centeredness", and a "grandiose sense of self-entitlement and manipulative behaviours". According to the assessment, he had a "pervasive tendency to demean, humiliate others and violate their rights and feelings", and was "unable to reflect on the consequences of his actions."
  
  In a speech to the Filipino community in Russia, Duterte revealed that he has myasthenia gravis, a neuromuscular disease, which makes his eye droop.