Its formation and development experience three phrase such as latent,delomorphic,acute changeable.Its occurrence has such characteristics as fulminant,violent,heat,mixing,changeable and obstinate.

• 其形成与演变大体经历了隐匿态、显现态、极变态三期,其致病具有骤发性、酷烈性、火热性、兼夹性、善变性、顽固性等特点。