Medical terminology is built from word parts: a prefix, a root, and a suffix. The suffix, the ending of the word, usually carries the key information, identifying the condition, the procedure, or the symptom. Once you know the common suffixes, you can decode most medical terms without memorizing each one individually. This guide covers the high-yield suffixes used throughout nursing school and on the NCLEX-PN and NCLEX-RN, organized by category, each with its meaning, an example, pronunciation where it helps, and why it matters in practice.
What a medical suffix is
A suffix is the ending of a medical word, and it almost always identifies one of three things: a condition (-itis is inflammation), a procedure (-ectomy is surgical removal), or a symptom (-algia is pain). Knowing the common endings lets you break apart unfamiliar terms.
A medical word is typically built from a root (the body part or system, such as cardi for heart), an optional prefix at the front (which often indicates where, when, or how much, such as brady for slow), and a suffix at the end (what is happening). Combined, bradycardia is brady + cardi + a, a slow heart. The suffix carries much of the meaning, because it identifies what is actually occurring.
One point of early confusion: several suffixes simply mean "pertaining to," including -ac, -al, -ar, -ary, -ic, -ous, and -tic (cardiac, renal, pulmonary). These turn a root into an adjective and rarely change the meaning of the word. The endings worth focusing on are the ones below, which identify a specific condition, procedure, or symptom.
You do not need to memorize all of them at once. Begin with the high-yield endings, the ones that appear most frequently. These are noted throughout.
How to decode a medical term
To break down an unfamiliar term, read the suffix first, then the prefix, then the root in the middle. The ending identifies the type of word; the rest fills in the detail.
- hepat/o (liver) + -megaly (enlargement) = hepatomegaly, an enlarged liver.
- nephr/o (kidney) + -ectomy (removal) = nephrectomy, a kidney removed.
- brady- (slow) + -pnea (breathing) = bradypnea, slow breathing.
- dys- (painful or difficult) + -uria (urine) = dysuria, painful urination.
The same root takes on a different meaning depending on its suffix. Using the root gastr (stomach):
- gastr + -itis = gastritis, an inflamed stomach.
- gastr + -ectomy = gastrectomy, the stomach removed.
- gastr + -ostomy = gastrostomy, a surgical feeding opening into the stomach.
The body part is identical in all three; only the suffix changes the meaning. On the NCLEX or an exit exam, decoding the ending often lets you answer a question even when the full term is unfamiliar, and it speeds up reading. (To review the root half of terminology, see our anatomy and physiology study guides, which are organized around body-system roots.) The tables below are grouped by what the ending indicates, rather than alphabetically, so you can study by category: conditions, procedures, symptoms, and tests.
The high-yield roots, prefixes, and suffixes on one page, with a worked-example column. No email, no signup.
Download the cheat sheet (free PDF) →Suffixes that name a condition or diagnosis
These endings appear in diagnoses. They indicate that something is wrong, and usually what kind.
| Suffix | Meaning | Example | Clinical relevance |
|---|---|---|---|
| -itisEYE-tis | Inflammation | appendicitis | Indicates inflammation or infection. Assess for redness, heat, swelling, pain, fever, and a rising white blood cell count. |
| -osis | Abnormal condition or state | cyanosis, acidosis | An abnormal condition or process, often without the active inflammation that -itis implies. Identify it and monitor for worsening. |
| -iasisEYE-uh-sis | Presence or formation of | cholelithiasis (gallstones) | Usually indicates that stones have formed. Assess for blockage, pain, and infection behind the obstruction. |
| -pathy | Disease | neuropathy | Disease of an organ or system. Assess that system; for neuropathy, check sensation and the feet in a diabetic patient. |
| -omaOH-muh | Tumor or mass | carcinoma, hematoma | A mass. The distinction between benign and malignant matters, and a hematoma can expand and compromise circulation. |
| -megalyMEG-uh-lee | Enlargement | hepatomegaly, cardiomegaly | An enlarged organ, often reflecting underlying disease. Cardiomegaly is associated with heart failure. |
| -celeseel | Hernia, protrusion, or bulge | cystocele | A bulge through a weakened wall. Assess for pressure on nearby structures and signs of strangulation. |
| -stenosissteh-NOH-sis | Narrowing or stricture | aortic stenosis | A narrowed vessel, valve, or passage that limits flow. Assess perfusion or function distal to the narrowing. |
| -sclerosisskleh-ROH-sis | Hardening | atherosclerosis | Hardened, stiff tissue or vessels. A major risk factor for stroke, myocardial infarction, and poor circulation. |
| -malaciamuh-LAY-shuh | Softening | osteomalacia | Abnormal softening that weakens the structure. Soft bone increases fall and fracture risk; reinforce safety and nutrition. |
| -ectasisEK-tuh-sis | Dilation, or in the lung, incomplete expansion | atelectasis | Atelectasis is a classic post-operative complication. Encourage deep breathing, incentive spirometry, and early ambulation. |
| -plasiaPLAY-zhuh | Growth or formation of cells | hyperplasia (BPH) | Abnormal tissue growth. Dysplasia can be pre-cancerous, and benign prostatic hyperplasia obstructs urine flow. |
-itis sounds like "it is" inflamed. For the three condition endings, think of a progression: -itis is inflammation, -osis is an abnormal condition, and -pathy is disease.
Suffixes for surgery and procedures
These endings indicate a surgical or bedside procedure. The key is distinguishing them, because cutting into a structure, creating an opening, and removing a structure are very different procedures.
| Suffix | Meaning | Example | Clinical relevance |
|---|---|---|---|
| -ectomyEK-tuh-mee | Surgical removal (excision) | appendectomy | An organ or part is removed. Plan post-operative care and anticipate loss of that function, such as hormones after a thyroidectomy. |
| -otomyOT-uh-mee | Cutting into (incision) | tracheotomy, laparotomy | An incision is made, but nothing is removed. Monitor the incision for bleeding and infection. |
| -ostomyOS-tuh-mee | A new, lasting opening (stoma) | colostomy, tracheostomy | Creates an opening to the outside. Provide stoma and skin care, and monitor output and stoma color. |
| -plastyPLAS-tee | Surgical repair or reconstruction | rhinoplasty, angioplasty | The structure is repaired. Assess the reconstructed area, such as pulses and circulation after an angioplasty. |
| -pexyPEK-see | Surgical fixation (anchoring) | orchiopexy | An organ is anchored in place. Protect the fixation and monitor for displacement. |
| -rrhaphyRAH-fee | Suturing or stitching | herniorrhaphy | Tissue is sutured together. Monitor the suture line for dehiscence, bleeding, and infection. |
| -centesissen-TEE-sis | Puncture to withdraw fluid | thoracentesis, paracentesis | Fluid is aspirated. Position the patient, monitor vital signs and respiratory status, and observe the site afterward. |
| -tripsyTRIP-see | Crushing | lithotripsy | Crushes a calculus. After lithotripsy, strain the urine for fragments and monitor for hematuria and pain. |
For the three that sound alike: -ectomy means a part Exits (it is removed), -otomy means you Open it (cut into it), and -ostomy means an Opening to the Outside that remains.
Suffixes for signs and symptoms
These endings describe what a patient is experiencing or exhibiting. Many are direct cues for assessment, which makes them among the highest-yield endings to know.
| Suffix | Meaning | Example | Clinical relevance |
|---|---|---|---|
| -pneapuh-NEE-uh | Breathing | dyspnea, apnea, tachypnea | Describes a breathing pattern. Central to respiratory assessment; guides oxygenation and positioning interventions. |
| -algiaAL-jee-uh | Pain | myalgia, neuralgia | Pain in a region. Prompts a pain assessment and a management plan. |
| -dyniaDIN-ee-uh | Pain | mastodynia (breast pain) | A synonym for -algia. Recognizing both endings ensures a documented pain complaint is not missed. |
| -plegiaPLEE-jee-uh | Paralysis | hemiplegia, paraplegia | Loss of movement. Hemiplegia is a key stroke sign; plan for mobility, skin integrity, and aspiration risk. |
| -paresispuh-REE-sis | Partial weakness | hemiparesis | Weakness rather than full paralysis. Distinguish it from -plegia, as the degree affects the care plan. |
| -ptosisTOH-sis (silent p) | Drooping or sagging | blepharoptosis (drooping eyelid) | Drooping can be a neurologic red flag; it is part of stroke and myasthenia gravis assessment. |
| -rrheaREE-uh | Flow or discharge | diarrhea, rhinorrhea | Abnormal flow. Diarrhea causes fluid and electrolyte loss, and clear nasal drainage after head trauma may be CSF. |
| -rrhage / -rrhagiaRIJ / RAY-jee-uh | Bursting forth; heavy bleeding | hemorrhage, menorrhagia | Heavy bleeding is an emergency. Assess for shock (tachycardia, hypotension), apply pressure, and notify the provider. |
| -rrhexisREK-sis | Rupture | hysterorrhexis (uterine rupture) | Rupture of a structure, often acute and emergent. Monitor for sudden severe pain, bleeding, and shock. |
| -spasm | Sudden, involuntary contraction | bronchospasm, laryngospasm | An involuntary contraction. Airway spasms threaten breathing; keep bronchodilators and emergency equipment available. |
| -stasisSTAY-sis | Stopping or standing still | hemostasis, venous stasis | Flow stops or pools. Hemostasis is the goal after bleeding; venous stasis raises DVT and skin-breakdown risk. |
| -phagiaFAY-jee-uh | Eating or swallowing | dysphagia | Dysphagia is a major aspiration risk. Position the patient upright, modify textures, and assess swallowing. |
| -phasiaFAY-zhuh | Speech | aphasia, dysphasia | A speech deficit and a hallmark stroke sign. Distinguish expressive from receptive and adapt communication. |
| -phobia | Abnormal fear or sensitivity | photophobia | Photophobia is a meningitis and migraine cue. Reduce light exposure and perform a fuller neurologic assessment. |
| -emesisEM-eh-sis | Vomiting | hematemesis (vomiting blood) | Hematemesis signals GI bleeding. Monitor the amount and character and watch for aspiration. |
| -ptysisTIH-sis (silent p) | Spitting; coughing up | hemoptysis (coughing up blood) | Hemoptysis indicates a respiratory source of blood (TB, PE, cancer). Quantify it and protect the airway. |
| -trophytruh-fee | Development, growth, or nourishment | atrophy, hypertrophy | Refers to tissue development. Muscle atrophy results from immobility; reposition and provide range-of-motion exercises. |
| -opiaOH-pee-uh | Vision condition | diplopia (double vision), myopia | A vision change. Sudden double vision is a neurologic red flag, and any vision deficit is a fall risk. |
Suffixes for tests, labs, and imaging
These endings appear on orders, lab reports, and imaging results. Many correspond directly to a value you will monitor or a procedure you will prepare a patient for.
| Suffix | Meaning | Example | Clinical relevance |
|---|---|---|---|
| -emiaEE-mee-uh | Blood condition | anemia, hyperkalemia | A blood abnormality. Correlate with laboratory values; hyperkalemia (high potassium) is a cardiac emergency. |
| -peniaPEE-nee-uh | Deficiency or low count | thrombocytopenia, neutropenia | A low count. Low platelets warrant bleeding precautions; low neutrophils warrant neutropenic precautions. |
| -cytosissy-TOH-sis | Increase in cells | leukocytosis | An elevated cell count. A high white count (leukocytosis) commonly indicates infection or inflammation. |
| -uriaYOO-ree-uh | Urine condition | hematuria, oliguria, dysuria | A urinary finding. Oliguria (low output) warns of renal or perfusion problems; hematuria suggests UTI, stones, or trauma. |
| -gram | The record or image (the result) | electrocardiogram (ECG) | The image or tracing itself. Prepare the patient and review the result, such as the ECG strip. |
| -graphy | The process of recording or imaging | angiography | The procedure. Manage consent, contrast dye allergies, NPO status, and post-procedure monitoring. |
| -scopyskuh-pee | Visual exam with a scope | colonoscopy | A direct visual examination. Manage the preparation (bowel prep, NPO, sedation) and the recovery. |
| -opsyOP-see | Viewing or sampling tissue | biopsy | Tissue sampling for diagnosis. Obtain consent, label the specimen, and monitor the site for bleeding. |
| -metrymeh-tree | Process of measuring | spirometry, pulse oximetry | A measurement test, often performed by the nurse. Trend the result over time. |
The blood and urine endings connect directly to lab interpretation. Our lab values cheat sheet complements this section.
Additional word-building endings
These endings do not fit the categories above but appear frequently in pathophysiology and pharmacology.
| Suffix | Meaning | Example | Clinical relevance |
|---|---|---|---|
| -lysisLIH-sis | Breakdown, destruction, or separation | hemolysis, dialysis | Breakdown or freeing of tissue. Hemolysis is the rupture of red cells; dialysis performs the kidney's function. |
| -genesis | Formation or origin | pathogenesis | How something forms. Understanding the pathogenesis explains why a given treatment works. |
| -poiesispoy-EE-sis | Production (especially of cells) | hematopoiesis | Cell production. Explains why chemotherapy or marrow disorders reduce blood counts. |
| -gen / -genic | Producing or causing | pathogen, carcinogen | Identifies the cause or source. Recognizing a pathogen or carcinogen guides infection control and risk education. |
Commonly confused pairs
Several endings look or sound similar and are common sources of error. Review them side by side.
-otomy vs. -ostomy vs. -ectomy
-otomy: an incision; nothing is removed (tracheotomy).
-ostomy: a lasting opening, a stoma (colostomy).
-ectomy: surgical removal (appendectomy).
The -rrh- family
-rrhea: flow or discharge (diarrhea).
-rrhage / -rrhagia: heavy bleeding (hemorrhage).
-rrhaphy: suturing, a repair (herniorrhaphy).
-rrhexis: rupture (hysterorrhexis).
-itis vs. -osis vs. -pathy
-itis: inflammation (gastritis).
-osis: an abnormal condition (cyanosis).
-pathy: disease of an organ or system (neuropathy).
Other easily mistaken pairs
-plegia vs. -paresis: full paralysis vs. partial weakness.
-algia vs. -dynia: both mean pain.
-phagia vs. -phasia: swallowing vs. speech.
Medical words also change form when pluralized, which can make a familiar term look unfamiliar. The common rules: -is becomes -es (diagnosis to diagnoses), -um becomes -a (bacterium to bacteria), -us becomes -i (nucleus to nuclei), and -a becomes -ae (vertebra to vertebrae).
How to memorize medical suffixes
Memorizing a long list by rote is inefficient. The following strategies are more effective:
- Group them by function rather than alphabetically, as this guide does. Related endings are easier to retain together.
- Choose one anchor word for each ending, such as appendicitis for -itis. When the ending escapes you, recall the anchor word and work backward.
- Say each suffix out loud using the pronunciation column. Terms are recalled more reliably when they can be pronounced.
- Decode new terms as you encounter them in lectures, clinicals, and charts, rather than only reviewing the list.
- Use active recall. Testing yourself is considerably more effective than rereading.
Active recall is the most important of these, and space your review across several days rather than a single session. And here's where the drug-name endings pay off right away: our pharmacology practice quiz is full of the medications behind suffixes like -pril, -olol, and -statin. Recognizing the ending is often half the question.
Drug suffixes are a separate system
The suffixes above describe anatomy and conditions. Drug names use a separate set of endings, called naming stems, that indicate a medication's class. Recognizing them helps you anticipate a drug's action and its key nursing considerations, which is particularly useful on pharmacology exams.
| Drug ending | Class | Example | Nursing considerations |
|---|---|---|---|
| -pril | ACE inhibitors | lisinopril | Monitor for a dry cough and elevated potassium. |
| -sartan | ARBs | losartan | Similar to ACE inhibitors without the cough; monitor potassium. |
| -olol | Beta-blockers | metoprolol | Hold and reassess for bradycardia or hypotension. |
| -statin | Statins | atorvastatin | Monitor for muscle pain and check liver enzymes. |
| -prazole | Proton pump inhibitors | omeprazole | Reduces stomach acid; long-term use can lower magnesium and calcium. |
| -cillin | Penicillin antibiotics | amoxicillin | Assess for penicillin allergy before administering. |
| -mab | Monoclonal antibodies | infliximab | Monitor for infusion reactions and increased infection risk. |
| -setron | Antiemetics | ondansetron | Used for nausea; can prolong the QT interval. |
This is a brief overview. For fuller coverage, see our drug suffixes cheat sheet and the drug classifications study guide, along with our list of the 100 NCLEX-PN drugs to memorize.
FAQ
What is the difference between a prefix, a root, and a suffix in medical terms?
A medical word usually has three parts. The root is the body part or system (cardi means heart). The prefix sits in front and often indicates where, when, or how much (brady means slow). The suffix is the ending, and it indicates the condition, procedure, or symptom (-itis means inflammation).
What is the difference between -ostomy, -otomy, and -ectomy?
These three are easily confused. -otomy means cutting into something, so a tracheotomy is an incision. -ostomy means creating a new, lasting opening or stoma, such as a colostomy. -ectomy means surgically removing something, such as an appendectomy. One cuts in, one creates an opening, one removes a structure.
Do I have to memorize every medical suffix for nursing school or the NCLEX?
No. Rather than memorizing every term, learn the common word parts and how they combine. Focus on the high-yield endings first, such as -itis, -ectomy, -ostomy, -emia, and -pnea. Once you know the frequent ones, you can decode most unfamiliar terms on sight.
How do you remember medical suffixes?
Group them by function rather than alphabetically. Choose one anchor word for each ending, such as appendicitis for -itis, so you can work backward when you forget. Say each suffix out loud using the pronunciation, and use active recall by testing yourself, which is more effective than rereading the list.
What suffix means surgical removal?
The suffix -ectomy means surgical removal or excision. An appendectomy is removal of the appendix, a mastectomy is removal of a breast, and a cholecystectomy is removal of the gallbladder. It should not be confused with -otomy, which means cutting into, or -ostomy, which means creating a new opening.
What is the suffix for inflammation?
The suffix -itis means inflammation. Appendicitis is inflammation of the appendix, and gastritis is inflammation of the stomach lining. When you see -itis, consider the signs of inflammation: redness, heat, swelling, pain, fever, and often a rising white blood cell count.
How are medical suffixes different from drug suffixes like -pril and -statin?
They are separate systems. Medical suffixes are word parts that describe a condition, procedure, or symptom, such as -itis, -ectomy, and -emia. Drug suffixes are naming stems that indicate a medication's class, such as -pril for ACE inhibitors, -statin for statins, and -olol for beta-blockers. Both are worth learning, but they answer different questions.
Putting it together
Medical terminology becomes manageable once you recognize the pattern. You do not need to memorize every term, only the common word parts and how they combine. Start with the high-yield endings, learn one anchor word for each, and decode unfamiliar terms as you encounter them.
Download the free cheat sheet for quick reference, and when you're ready to apply the drug-name endings, the pharmacology practice quiz puts them to work on real NCLEX-style questions.