Shijun Xi

Shijun Xi serves as Clinical Associate Professor of Medicine and Section Head of Allergy & Immunology at the University of Southern California. His clinical focus includes mast cell activation disorders and autonomic dysfunction syndromes.

Research explores links between mast cell disorders and postural orthostatic tachycardia syndrome (POTS), with publications in cardiology and immunology journals. He contributed to global consensus guidelines for mast cell syndrome diagnosis.

Articles emphasize sinonasal manifestations of immune disorders and neuropharmacology. His work bridges clinical observations with molecular mechanisms in allergy and neurology.

He mentors medical students and residents, advancing clinical protocols for immune-mediated conditions at USC-affiliated hospitals.