How medical words are built

D

Dys-

Difficult, painful, or not working properly.

Also called:

Dys prefix, disordered, impaired

Pronounced:

diss

What it means

Difficult, painful, abnormal or not working properly.

  • Dysphagia — difficulty swallowing
  • Dyspnoea — difficulty breathing, breathlessness
  • Dysuria — pain or burning on passing urine
  • Dyspepsia — indigestion
  • Dysmenorrhoea — painful periods
  • Dyspareunia — pain during sex

Two worth distinguishing: dysphagia is difficulty swallowing; dysphasia is difficulty with language, usually after a stroke. One letter, entirely different problems.

In practice

Throughout clinic letters and referral forms, often as a compressed way of listing symptoms.

Why it matters

Take dysphagia seriously. New, persistent or progressive difficulty swallowing needs urgent assessment — it is a red flag symptom and warrants a two-week referral.

Use the prefix to decode the letter, and ask if a word you do not recognise is being used about you.

Dr Mohammad Zubair Khan, GMC-registered private GP and founder of Cheshire Clinics

Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469

Last reviewed

August 30, 2026

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