A bright yang disease with a slow pulse, and the patient perspires without aversion to cold, with heavy sensation in the body, short breath and abdominal fullness with panting, tidal fever, should indicate the external region about to relieve in which case it is necessary to attack the internal region. When two yangs are diseased simultaneously, with the greater yang symptoms already relieved, and the patient displays tidal fever, continual perspiration in hands and feet, constipation and delirium, inducing bowel movement will cure the disease. When a bright yang disease belongs to the internal excess heat, its disorders are located in the stomach and intestines. Thus, excess heat in the stomach and intestine is the key to differential diagnosis.