TABLE 1.

The proportion of the clinical symptoms of IBD (Li et al., 2017; Annese, 2019; Rogler et al., 2021).

	Symptoms	Crohn’s disease	Ulcerative colitis
Gastrointestinal Symptoms	Abdominal pain	63–79.4%	37.7–64.9%
	Diarrhoea	36.4–54.2%	72.8–83.7%
	Mucopurulence and bloody stool	16.3%	74.2%
	Anal fistula and perianal abscess	19.6%	—
General Manifestations	Anaemia	24.8%	13.4%
	Fever	32%	18.2%
	Weight loss	44.4%	28.4%
Extra-intestinal Manifestations	Peripheral arthritis	10–20%	4–14%
	Metabolic bone disease	20–50%	—
	Primary sclerosing cholangitis	<1%	4–5%
	Anterior uveitis	5–12%	3.5–4.1%
	Erythema nodosum	5–15%	2–10%
	Oral aphthous ulcers	5–50%	<1%