Ulcerative Colitis (UC) is a chronic and relapsing disease of the large intestine (rectum and colon) characterized by inflammation of the mucosa and submucosa.

• 溃疡性结肠炎(Ulcerative Colitis,UC)又称慢性非特异性溃疡性结肠炎,是一种病因尚未明确的慢性疾病,以大肠(直肠与结肠)粘膜与粘膜下炎症为病变的主要特征。