Two for the ‘easily missed’ category:
Eagle Syndrome. This has nothing to do with being bald or growing feathers, but refers to symptoms caused by elongation of the styloid bone/ossification of the stylohyoid ligament, with consequent impingement on local structures. This can cause unilateral throat/neck pain which may be worse on chewing or on turning the head, a sensation of a foreign body in the throat, referred otalgial, headache, dysphagia, and dizziness.
Eosinophilic oesophagitis. This is an allergic inflammatory response of the oesophagus, which can be caused by food allergy or aeroallergens. Young children tend to present with failure to thrive and food refusal; adolescents with vomiting and epigastric or chest pain; and adults with dysphagia, heartburn, chest pain, or food bolus obstruction. Endoscopy can be normal. The primary treatment is spraying a steroid inhaler into the mouth and dry-swallowing.