HESI A2 Vocabulary: 50+ Healthcare Terms You Must Know

What the HESI A2 Vocabulary Section Tests

The Vocabulary and General Knowledge section consists of 50 questions to be completed in 50 minutes — almost exactly 1 minute per question. Question formats are generally:

• Definition selection: "Which of the following best defines [word]?"
• Sentence completion: "The patient's [blank] indicated severe dehydration." (Choose the word that best fits.)
• Synonym identification: "Which of the following is most similar in meaning to [word]?"
• Context-based usage: "In the sentence above, the word [X] most likely means..."

Notice that none of these formats test spelling or pronunciation. They all test whether you know what a word means and how it is used. Vocabulary knowledge transfers directly into score points — there is no strategy substitute for knowing the words.

The 6 Categories of HESI A2 Vocabulary

1. Medical Terminology (high frequency)

Words built from Greek and Latin roots that describe anatomical structures, conditions, and procedures. Examples: cardiomegaly (enlarged heart), nephritis (kidney inflammation), hepatomegaly (enlarged liver), arthralgia (joint pain), hemoptysis (coughing up blood).

Study approach: Learn the most common prefixes (hyper-, hypo-, brady-, tachy-), root words (cardio-, nephro-, hepato-, arthro-, hemo-, neuro-), and suffixes (-itis, -ectomy, -emia, -ology, -algia). Once you know 15–20 prefix/suffix combinations, you can decode hundreds of medical terms.

2. Anatomy Terms (high frequency)

Names of organs, body parts, and anatomical relationships. Examples: cranial, caudal, anterior, posterior, lateral, medial, proximal, distal, supine, prone. Plus structural terms like ventricle, atrium, alveolus, nephron, neuron.

Study approach: Learn directional and positional terms first — they appear in many questions. Then memorize key organ structures across the major body systems.

3. Conditions and Diseases (high frequency)

Names of illnesses and clinical conditions. Examples: hypertension, hypotension, anemia, dehydration, jaundice, edema, dyspnea, syncope, ischemia. Often paired with vocabulary about symptoms (cyanosis, pallor, lethargy, malaise).

Study approach: When studying medical terminology, look at conditions that commonly appear in nursing care: cardiovascular, respiratory, and metabolic conditions are most heavily tested.

4. Procedures and Treatments (medium frequency)

Words describing tests, treatments, and clinical interventions. Examples: catheterization, intubation, palpation, auscultation, percussion, biopsy, anastomosis, cauterization. Also non-procedural healthcare terms: aseptic, sterile, contraindicated, indicated, prophylactic.

Study approach: Focus on the procedures most commonly performed by nurses (assessments, medication administration, wound care). These vocabulary words appear in nursing school early and are worth knowing for future use.

5. General English in Healthcare Context (medium frequency)

Standard English words used heavily in healthcare. Examples: alleviate, exacerbate, mitigate, deteriorate, remit, abate, ascertain, palliative, persistent, transient. Also action verbs common in nursing: monitor, document, administer, evaluate, intervene.

Study approach: Read nursing journal abstracts or short clinical case reports. The vocabulary used in clinical writing is exactly what the HESI tests.

6. General English (lower frequency, still tested)

High-school and college-level English words that may appear in any context. Examples: acquiesce, ambivalent, candid, capricious, conjecture, judicious, prudent, tenuous. These words may not be healthcare-specific, but they appear in patient communication, charting, and clinical reading.

Study approach: If your overall English vocabulary is strong, you can deprioritize this category. If English is your second language or you have not done much reading recently, allocate more time here.

50+ HESI A2 Healthcare Terms to Memorize

This is not exhaustive, but mastering these 50+ terms covers a meaningful share of healthcare vocabulary that appears on the HESI A2.

Cardiovascular and Respiratory

• Hypertension — high blood pressure
• Hypotension — low blood pressure
• Tachycardia — fast heart rate
• Bradycardia — slow heart rate
• Dyspnea — difficulty breathing
• Apnea — absence of breathing
• Cyanosis — bluish discoloration from low oxygen
• Hemoptysis — coughing up blood
• Edema — swelling from fluid accumulation
• Ischemia — reduced blood supply to tissue

Neurological and Mental Status

• Lethargic — drowsy, slow to respond
• Comatose — unresponsive, deep unconsciousness
• Syncope — fainting
• Seizure — uncontrolled electrical brain activity
• Aphasia — impaired ability to speak or understand language
• Paresthesia — tingling or numbness
• Hemiparesis — weakness on one side of the body

Gastrointestinal and Genitourinary

• Anorexia — loss of appetite
• Emesis — vomiting
• Hematemesis — vomiting blood
• Dysphagia — difficulty swallowing
• Constipation — infrequent or difficult bowel movements
• Diarrhea — loose, frequent stools
• Hematuria — blood in urine
• Oliguria — reduced urine output
• Anuria — absence of urine output
• Polyuria — excessive urination

General Symptoms and Signs

• Pallor — paleness of skin
• Jaundice — yellowing of skin and eyes
• Pruritus — itching
• Malaise — general feeling of being unwell
• Fatigue — extreme tiredness
• Diaphoresis — profuse sweating
• Erythema — redness of the skin

Procedures and Care

• Auscultation — listening with a stethoscope
• Palpation — examination by touch
• Percussion — examination by tapping
• Aseptic — free from contamination
• Sterile — completely free of microorganisms
• Prophylactic — preventive (medication or treatment)
• Palliative — relieving symptoms without curing
• Contraindicated — not advised for use

Common General English in Healthcare

• Alleviate — to relieve or lessen
• Exacerbate — to make worse
• Mitigate — to lessen severity
• Deteriorate — to get worse
• Remit — to subside or lessen (of a disease)
• Abate — to decrease in intensity
• Persistent — continuing
• Transient — temporary, brief
• Acute — sudden onset, severe
• Chronic — long-lasting, persistent

The 3-Week HESI Vocabulary Study Plan

• Week 1: Build flashcards covering all 6 categories. Aim for 200–300 cards. Review 30–40 cards per day, focusing on medical terminology and conditions/diseases.
• Week 2: Continue daily review. Add general English words you encounter in your reading. Take a HESI vocabulary practice section to identify weak areas.
• Week 3: Drill weak areas. Take 2–3 timed practice sections (50 questions in 50 minutes). Review all incorrect answers and add unfamiliar words to your flashcard deck.

Common Vocabulary Mistakes

• Studying random word lists. Pre-made vocabulary lists from non-HESI sources may include words that never appear on the test. Use HESI-specific materials when possible.
• Memorizing definitions without context. The HESI tests how words are used, not just what they mean. Always learn words in the context of healthcare situations.
• Skipping prefixes and suffixes. Learning 15–20 medical prefix/suffix combinations unlocks hundreds of words. This is the single highest-leverage study activity for medical terminology.
• Cramming the night before. Vocabulary depends on long-term retention. 3 weeks of consistent review beats 3 days of cramming, even with the same total study hours.

Frequently Asked Questions