Medical words can feel overwhelming — but most follow simple patterns. Once you learn the basic building blocks, you can start to decode what doctors and nurses are saying with confidence.
This quick reference guide helps you understand prefixes, roots, and suffixes — the “puzzle pieces” that make up most medical terms.

Prefixes: The Starting Point

Prefixes usually describe where, how much, or how fast.
Understanding just a few can make sense of hundreds of terms.

Brady- → slow (bradycardia = slow heart rate)

Tachy- → fast (tachypnea = fast breathing)

Hyper- → above, excessive (hypertension = high blood pressure)

Hypo- → below, low (hypoglycemia = low blood sugar)

Endo- → inside (endoscopy = looking inside the body)

Peri- → around (pericardium = tissue around the heart)

Dys- → difficult or abnormal (dysphagia = difficulty swallowing)

Roots: The Core Meaning

Roots tell you what body part or system the word is referring to.

Cardi(o) → heart

Nephr(o) → kidney

Gastr(o) → stomach

Derm(a) → skin

Pulmon(o) → lungs

Hemat(o) → blood

Neur(o) → nerves

Suffixes: The Ending That Explains

Suffixes describe what’s happening — a condition, study, or procedure.

-itis → inflammation (arthritis = joint inflammation)

-ectomy → surgical removal (appendectomy = remove appendix)

-emia → blood condition (anemia = low red blood cells)

-ology → study of (cardiology = study of the heart)

-plasty → surgical repair (angioplasty = repair of artery)

-pathy → disease or disorder (neuropathy = nerve damage)

-gram → record or image (mammogram = breast X-ray)

Quick Practice

Try decoding these on your own:

Hypothermia → ____________

Endocarditis → ____________

Nephrology → ____________

Dermatitis → ____________

Tachycardia → ____________

(Answers: low body temperature, inflammation inside the heart, study of kidneys, inflammation of skin, fast heart rate)

Reflect: What Words Empower You?

What medical terms have confused you in the past? Which ones do you finally understand now?

Understanding medical terminology is one of the simplest ways to feel calm, informed, and in control of your health. Keep this sheet close during appointments or when reading test results — and remember, every term can be broken down into something you can understand.

As always thanks for being here!