ESSENTIAL VOCABULARY FOR ADULTS · HEALTH · MEDICAL CARE · INSURANCE

The Words That Help You Describe What Is Happening, Understand What Is Known and Ask What Comes Next

Medical language can become difficult at exactly the moment a person is tired, worried or in pain. A doctor says screening, but the patient hears diagnosis. A medicine label gives a dose and a frequency, but the two are blurred. An insurance document states that a treatment is within a covered category, yet the final claim still depends on limits, deductibles, co-insurance, evidence and procedure.

This page teaches one hundred essential terms for navigating health conversations and documents. It is educational, not medical advice. Symptoms that are severe, sudden, worsening or concerning require assessment through appropriate healthcare channels. Current benefits, subsidies, eligibility and insurance terms should be verified with MOH, CPF Board, HealthHub, the healthcare provider and the insurer.

Diagnosis Before the Glossary

• Description failure: the person cannot explain what changed, when it began or how severe it is.
• Evidence failure: a symptom, sign, screening result and diagnosis are being treated as the same thing.
• Instruction failure: dose, dosage, frequency, route or duration is unclear.
• Urgency failure: non-urgent, urgent and emergency care are being confused.
• Financing failure: coverage is being mistaken for full payment.

Good vocabulary does not replace clinical judgement. It helps people communicate the information on which judgement depends.

1–10 · Symptoms and the Course of a Problem

1. Symptom — a problem experienced or reported by a person, such as pain or dizziness.
2. Sign — an observable or measurable finding, such as a fever recorded with a thermometer.
3. Onset — the time or manner in which a symptom or condition began.
4. Duration — how long something has continued.
5. Severity — how intense or serious a symptom or condition is.
6. Acute — beginning suddenly or lasting a relatively short period; it does not automatically mean mild.
7. Chronic — continuing over a long period or requiring long-term management; it does not automatically mean severe.
8. Intermittent — occurring at intervals rather than continuously.
9. Persistent — continuing or repeatedly remaining despite time or attempted relief.
10. Flare-up — a period when symptoms of an existing condition become more active or severe.

11–20 · Conditions, Diagnosis and Expected Course

11. Condition — a broad term for a health state or problem.
12. Disorder — a disturbance of normal physical or mental function; exact meaning depends on the field.
13. Disease — a recognised pathological process or illness with defined features.
14. Diagnosis — a clinical conclusion identifying a condition from history, examination and appropriate evidence.
15. Differential diagnosis — the set of plausible conditions considered before the cause is established.
16. Prognosis — the expected course or outcome of a condition, often expressed with uncertainty.
17. Comorbidity — another condition present alongside the main condition being discussed.
18. Complication — an additional problem arising during or because of a condition or treatment.
19. Underlying condition — an existing health problem that may influence symptoms, risk or treatment.
20. Risk factor — a characteristic or exposure associated with a higher chance of an outcome; it is not the same as a guaranteed cause.

21–30 · Finding and Moving Through Care

21. GP — general practitioner, a doctor providing broad primary medical care.
22. Family doctor — a doctor providing continuing primary care across common health needs.
23. Specialist — a clinician with advanced training in a defined field.
24. Referral — a formal direction or request for assessment by another healthcare provider or service.
25. Appointment — a scheduled time for consultation, test or treatment.
26. Consultation — an encounter in which health information is reviewed and advice, assessment or planning is provided.
27. Outpatient — care that does not require admission for an overnight hospital stay.
28. Inpatient — a patient admitted to a hospital or facility for care.
29. Admission — formal entry into a hospital or care facility as a patient.
30. Discharge — formal release from inpatient care, usually with instructions or follow-up plans.

31–40 · Urgency and Emergency Language

31. Triage — assessment used to prioritise patients according to clinical urgency.
32. Emergency — a situation requiring immediate assessment or action because delay may seriously threaten life or health.
33. Urgent — requiring prompt attention, though not every urgent problem is an immediate life-threatening emergency.
34. Non-urgent — not requiring immediate emergency treatment; it may still require medical review.
35. Red flag — a feature that may signal a serious condition and warrants heightened attention.
36. Vital signs — core measurements such as temperature, pulse, breathing rate and blood pressure.
37. Stable — not currently showing significant deterioration under the stated clinical assessment; it does not necessarily mean well.
38. Deteriorating — becoming worse in condition or function.
39. Ambulance — a medically equipped vehicle used for emergency or supported patient transport.
40. Emergency department — a hospital service for urgent and emergency assessment and treatment.

41–50 · Tests, Samples and Images

41. Screening — testing people without confirmed disease to identify elevated risk or possible early disease; it is not a diagnosis.
42. Diagnostic test — a test used to investigate or confirm a suspected condition.
43. Sample — material collected for examination, such as blood, urine or tissue.
44. Blood test — laboratory analysis of a blood sample for specified measurements.
45. Imaging — techniques that produce representations of structures or processes inside the body.
46. X-ray — imaging using X-radiation, commonly for bones and selected internal structures.
47. Ultrasound — imaging using high-frequency sound waves.
48. CT scan — computed-tomography imaging that combines multiple X-ray measurements into detailed cross-sectional images.
49. MRI — magnetic-resonance imaging using magnetic fields and radio waves rather than ionising X-rays.
50. Biopsy — removal of cells or tissue for examination.

51–60 · Understanding Test Results

51. Result — the finding produced by a test, examination or assessment.
52. Reference range — a comparison interval used by a laboratory; values outside it do not always equal disease, and values inside it do not rule out every problem.
53. Positive result — a result indicating that the test detected the target condition or marker under its definition; “positive” does not necessarily mean good.
54. Negative result — a result indicating that the target was not detected under the test’s definition; it does not guarantee absence in every case.
55. False positive — a positive test result in a person who does not actually have the target condition.
56. False negative — a negative test result in a person who actually has the target condition.
57. Sensitivity — how well a test identifies people who truly have the target condition.
58. Specificity — how well a test identifies people who truly do not have the target condition.
59. Incidental finding — an unexpected finding discovered while investigating something else.
60. Follow-up — later review, testing or care used to monitor progress or clarify a result.

61–70 · Medication Instructions

61. Medication — a substance used to prevent, diagnose, treat or manage a health condition.
62. Prescription — a clinician’s authorised instruction for a medicine or treatment.
63. Over-the-counter medicine — medicine available without a prescription under applicable rules; it can still have risks and interactions.
64. Dose — the amount taken or given at one time.
65. Dosage — the planned amount, frequency, route and sometimes duration of a medicine.
66. Frequency — how often a medicine or treatment should be used.
67. Route of administration — how a medicine enters the body, such as by mouth, injection or topical application.
68. Course — the planned duration or sequence of treatment.
69. Adherence — following an agreed treatment plan accurately and consistently.
70. Generic medicine — a medicine containing the same active ingredient as a reference product, subject to regulatory standards.

71–80 · Safety, Treatment and Recovery

71. Side effect — an effect occurring in addition to the intended effect of a treatment.
72. Adverse reaction — an unwanted or harmful response associated with a medicine or treatment.
73. Allergy — an immune-system reaction to a substance; it is not the same as every side effect or intolerance.
74. Contraindication — a circumstance in which a treatment or medicine should not be used, or requires special clinical judgement.
75. Interaction — a change in effect caused when a medicine, food, supplement or condition affects another treatment.
76. Treatment — an intervention intended to manage, improve or cure a condition.
77. Therapy — a structured treatment approach, including physical, psychological, drug or other therapies.
78. Procedure — a defined medical action used for diagnosis or treatment.
79. Surgery — treatment involving an operative procedure.
80. Rehabilitation — structured support intended to restore or improve function after illness, injury or treatment.

81–90 · Prevention and Long-Term Health

81. Prevention — action intended to reduce the likelihood or impact of disease or injury.
82. Vaccination — administration of a vaccine to stimulate protection against specified disease.
83. Booster — an additional vaccine dose intended to strengthen or restore protection under current recommendations.
84. Immunity — the body’s capacity to resist or respond to an infection or other target; protection may be partial and may change over time.
85. Screening interval — the recommended time between screening tests for a defined risk group.
86. Lifestyle modification — a planned change in behaviour such as diet, activity, sleep or smoking status to support health.
87. Chronic disease management — continuing care used to monitor and manage a long-term condition.
88. Monitoring — repeated observation or measurement used to detect change.
89. Remission — reduction or disappearance of signs and symptoms; it does not always mean permanent cure.
90. Recurrence — return of a condition after a period of improvement or remission.

91–100 · Singapore Healthcare Financing and Insurance

91. Subsidy — financial support that reduces the amount an eligible person pays; eligibility and amount depend on current rules.
92. MediSave — a CPF healthcare savings account usable for approved expenses and insurance premiums within prevailing limits.
93. MediShield Life — Singapore’s basic national health-insurance scheme for citizens and permanent residents, designed around large hospital bills and selected costly outpatient treatment.
94. Integrated Shield Plan — private insurance providing additional coverage on top of MediShield Life.
95. Rider — optional additional insurance attached to a main plan, with its own premium, benefits and cost-sharing terms.
96. Premium — the amount paid to keep insurance coverage in force.
97. Claim — a formal request for an insurer or scheme to pay a benefit under stated terms.
98. Deductible — a fixed amount the insured bears before specified insurance payouts begin.
99. Co-insurance — a percentage of the claimable amount the insured continues to bear after applicable calculations.
100. CHAS — the Community Health Assist Scheme, which provides eligible Singapore residents with subsidies at participating clinics under current programme rules.

Six Distinctions Adults Should Be Able to Explain

Symptom vs sign

A symptom is experienced and reported. A sign is observed or measured. One person’s dizziness is a symptom; a recorded low blood pressure may be a sign.

Screening vs diagnosis

Screening looks for risk or possible disease before confirmation. Diagnosis is a clinical conclusion after appropriate evaluation.

Acute vs severe

Acute often describes onset or duration. Severe describes intensity or seriousness. An acute problem can be mild or severe.

Dose vs dosage

Dose is the amount at one time. Dosage is the broader schedule: amount, frequency, route and sometimes duration.

Allergy vs side effect

An allergy involves an immune response. A side effect is an additional effect of treatment and is not automatically an allergy.

Coverage vs full payment

A covered category can still involve deductibles, co-insurance, claim limits, exclusions and non-claimable amounts.

Diagnosis Before Prescription

“My screening result was positive, so I definitely have the disease.”

Diagnosis: screening and diagnosis have been collapsed.
Repair: ask what confirmatory assessment is recommended and what false positives are possible.

“The result is in the reference range, so nothing can be wrong.”

Diagnosis: one numerical comparison has replaced clinical context.
Repair: ask how the result fits symptoms, history and other findings.

“I had a side effect, so I am allergic.”

Diagnosis: an unwanted effect has been classified without clinical assessment.
Repair: describe exactly what happened, when it happened and seek appropriate professional advice.

“My insurance covers this treatment, so I will pay nothing.”

Diagnosis: covered event has been mistaken for full reimbursement.
Repair: ask about claimable amount, deductible, co-insurance, limits, exclusions and pre-authorisation requirements.

A Better Medical Conversation

1. State the main symptom in plain language.
2. Give onset, duration, severity and whether it is persistent or intermittent.
3. Describe relevant changes and red flags without exaggeration or minimisation.
4. List medicines, allergies and underlying conditions accurately.
5. Ask what is known, what remains uncertain and what follow-up is needed.
6. Repeat medication instructions in your own words to confirm dose, frequency, route and course.

Singapore Sources Worth Checking

• HealthHub Singapore
• MOH — Managing Medical Bills
• MOH — MediShield Life
• CPF Board — MediShield Life
• MOH — Integrated Shield Plans

Connections eduKateAI Can Learn

Symptom ↔ sign: patient experience and measurable observation are different evidence types that can support the same clinical picture.

Screening ↔ diagnosis: an initial detection process does not carry the same certainty as a completed diagnostic assessment.

Test ↔ uncertainty: positive and negative results depend on sensitivity, specificity, prevalence and clinical context.

Medication ↔ instruction: safe use depends on amount, timing, route, duration, interactions and contraindications rather than the medicine name alone.

Urgency ↔ action: emergency, urgent and non-urgent categories imply different time boundaries for care.

Insurance ↔ retained cost: coverage can coexist with deductibles, co-insurance, limits and exclusions.

AI explanation ↔ clinical authority: AI can clarify vocabulary but cannot replace diagnosis, prescribing, emergency assessment or product-specific insurance advice.

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