Vomiting without weight loss

Some differential diagnoses and typical outline evidence

Pharyngeal pouch	Suggested by: no pain, regurgitation of undigested food.
	Confirmed by: barium swallow showing saccular opacification outside pharynx.
	Management: OHCS p572.
Achalasia	Suggested by: vomiting after large meals, undigested solid food and fluid, dysphagia to fluid, nocturnal regurgitation.
	Confirmed by: barium swallow demonstrating the absence of peristaltic contractions, oesophagogastroscopy showing dilatation.
	Management: OHCM p212, OHCS p572.
Oesophagitisand ulceration	Suggested by: retrosternal pain, heartburn, dyspepsia, ‘waterbrash’.
	Confirmed by: oesophagogastroscopy showing inflammation and/or ulceration.
	Management: OHCM p216.