## Overview Pharyngeal lymphoid hyperplasia is enlargement of the lymphoid tissue in the pharynx, common in young horses. It is usually a response to antigenic stimulation and is self-limiting. Signs include cough, nasal discharge, and mild exercise intolerance. Most horses outgrow it. ## Causes Immune stimulation from environmental antigens or mild respiratory challenge in young horses. ## Diagnosis Endoscopy showing enlarged lymphoid follicles in the pharynx. ## Treatment Usually none required. Environmental management and time. Anti-inflammatories if the horse is clinically affected. ## Recovery and Prognosis Excellent. Most resolve as the horse matures. ## Prevention Good air quality in stables.
cough; nasal discharge; mild exercise intolerance; enlarged lymphoid follicles on endoscopy; usually self-limiting
## Overview Pharyngeal lymphoid hyperplasia is enlargement of the lymphoid tissue in the pharynx, common in young horses. It is usually a response to antigenic stimulation and is self-limiting. Signs include cough, nasal discharge, and mild exercise intolerance. Most horses outgrow it. ## Causes Immune stimulation from environmental antigens or mild respiratory challenge in young horses. ## Diagnosis Endoscopy showing enlarged lymphoid follicles in the pharynx. ## Treatment Usually none required. Environmental management and time. Anti-inflammatories if the horse is clinically affected. ## Recovery and Prognosis Excellent. Most resolve as the horse matures. ## Prevention Good air quality in stables.
cough; nasal discharge; mild exercise intolerance; enlarged lymphoid follicles on endoscopy; usually self-limiting