Detailed Medical Terms Guide for Medical Students
Medical terminology can feel like a foreign language at the start of medical school. This expanded guide covers essential terms every medical student should know — organized by system and concept — with clear, practical explanations.
Basic Prefixes, Suffixes & Roots
- Hyper- — Excessive or above normal (e.g., hypertension = high blood pressure)
- Hypo- — Deficient or below normal (e.g., hypoglycemia = low blood sugar)
- -itis — Inflammation (e.g., appendicitis, arthritis)
- -emia — Blood condition (e.g., anemia, septicemia)
- -ectomy — Surgical removal (e.g., appendectomy, cholecystectomy)
- -otomy — Cutting into (e.g., tracheotomy, laparotomy)
- -ostomy — Creating an opening (e.g., colostomy, tracheostomy)
- -pathy — Disease (e.g., neuropathy, cardiomyopathy)
- -osis — Abnormal condition (e.g., osteoporosis, cirrhosis)
- Cardio- — Heart
- Neuro- — Nerve or nervous system
- Hepato- — Liver
- Nephro-/Reno- — Kidney
- Pulmo-/Pneumo- — Lung
Cardiovascular Terms
- Myocardial Infarction (MI) — Heart attack; death of heart muscle due to blocked blood supply.
- Angina — Chest pain caused by reduced blood flow to the heart.
- Arrhythmia — Abnormal heart rhythm.
- Tachycardia — Fast heart rate (usually >100 bpm).
- Bradycardia — Slow heart rate (usually <60 bpm).
- Ischemia — Inadequate blood supply to a tissue or organ.
- Atherosclerosis — Build-up of fats and cholesterol in artery walls.
- Embolism — Blockage of a blood vessel by a clot or other material that has traveled from elsewhere.
- Thrombosis — Formation of a blood clot inside a blood vessel.
Respiratory Terms
- Dyspnea — Shortness of breath or difficult breathing.
- Hypoxia — Low oxygen levels in tissues.
- Apnea — Temporary cessation of breathing.
- Pneumonia — Infection that inflames the air sacs in one or both lungs.
- COPD — Chronic Obstructive Pulmonary Disease (includes emphysema and chronic bronchitis).
- Asthma — Chronic condition involving airway inflammation and narrowing.
- Hemoptysis — Coughing up blood.
- Cyanosis — Bluish discoloration of skin due to low oxygen.
Neurological Terms
- Stroke (CVA) — Sudden interruption of blood supply to the brain.
- Seizure — Sudden, uncontrolled electrical disturbance in the brain.
- Paresthesia — Abnormal sensation such as tingling or numbness.
- Ataxia — Lack of muscle coordination.
- Aphasia — Difficulty with language (speaking, understanding, reading, or writing).
- Syncope — Temporary loss of consciousness (fainting).
- Hemiplegia — Paralysis of one side of the body.
- Meningitis — Inflammation of the membranes covering the brain and spinal cord.
Gastrointestinal & Endocrine Terms
- Jaundice — Yellowing of skin and eyes due to high bilirubin.
- Edema — Swelling caused by excess fluid trapped in tissues.
- Sepsis — Life-threatening response to infection that can lead to organ failure.
- Anemia — Low red blood cell count or hemoglobin.
- Diabetes Mellitus — Group of diseases affecting how the body uses blood sugar.
- Hypothyroidism / Hyperthyroidism — Underactive or overactive thyroid gland.
- Cirrhosis — Late-stage scarring of the liver.
- Peptic Ulcer — Sore in the lining of the stomach or duodenum.
Diagnostic & Procedural Terms
- Biopsy — Removal of tissue for examination.
- Endoscopy — Visual examination of internal organs using a flexible tube with a camera.
- MRI — Magnetic Resonance Imaging; detailed images using magnets and radio waves.
- CT Scan — Computed Tomography; cross-sectional X-ray images.
- Prognosis — Expected course and outcome of a disease.
- Etiology — The cause or origin of a disease.
- Differential Diagnosis — The process of distinguishing a disease from others with similar symptoms.
- Pathophysiology — The disordered physiological processes associated with disease.
Study Tips for Medical Students
- Learn roots, prefixes, and suffixes first — they unlock hundreds of terms.
- Group terms by body system rather than memorizing randomly.
- Use flashcards and spaced repetition (Anki is popular among students).
- Relate terms to real patient cases or diagrams.
- Review high-yield terms repeatedly before exams.
Note: This is a study guide for educational purposes. Always refer to your textbooks, lectures, and clinical supervisors for accurate medical knowledge.
Which medical term still confuses you? Comment below and I’ll explain it in more detail.
