Health Comparisons

Conditions that look alike, medications that get mixed up, and benefits programs that share a name. These pages explain in plain language what each one actually is and how to tell them apart. They're general educational information, not medical advice — see the disclaimer for the full note.

Last reviewed on 2026-04-27.

Common Conditions

Cold vs Flu Both are respiratory viruses; the flu hits harder and faster, with fever and body aches more common. Virus vs Infection A virus is a type of pathogen; an infection is what happens when any pathogen establishes itself in the body. UTI vs Yeast Infection UTIs are bacterial infections of the urinary tract; yeast infections are fungal overgrowths, usually in the genitals.

Chronic & Long-Term

Type 1 vs Type 2 Diabetes Type 1 is an autoimmune loss of insulin production; Type 2 is mostly insulin resistance with later production decline. Osteoarthritis vs Rheumatoid Arthritis Osteoarthritis is wear-and-tear cartilage damage; rheumatoid arthritis is autoimmune attack on the joints. HIV vs AIDS HIV is the virus; AIDS is the late-stage syndrome that develops when untreated HIV severely damages the immune system.

Mind & Brain

Anxiety vs Depression Anxiety is fear or worry about the future; depression is persistent low mood and loss of interest. Dementia vs Alzheimer's Dementia is the umbrella term for cognitive decline; Alzheimer's is its most common cause. ADD vs ADHD ADD is an older term; ADHD is the current diagnosis and includes presentations with or without hyperactivity.

Heart, Pain & Coverage

Heart Attack vs Cardiac Arrest A heart attack is a plumbing problem (blocked blood flow); cardiac arrest is an electrical problem (the heart stops). Ibuprofen vs Acetaminophen Ibuprofen reduces inflammation; acetaminophen treats pain and fever without significant anti-inflammatory effect. Medicare vs Medicaid Medicare is age-based federal coverage (mostly 65+); Medicaid is income-based joint federal-state coverage. HDL vs LDL Cholesterol "Good" and "bad" cholesterol — two carrier particles with very different effects on the arteries. Aerobic vs Anaerobic Aerobic exercise uses oxygen for sustained energy; anaerobic exercise relies on short bursts without enough oxygen. Allergies vs Cold Allergies are immune reactions to substances like pollen; a cold is a viral infection. Asthma vs COPD Asthma is reversible airway inflammation, often starting in childhood; COPD is progressive lung damage usually from long-term smoking. Calories vs Kilojoules Calories and kilojoules both measure energy in food. 1 kilocalorie equals about 4.184 kilojoules. Hypoglycemia vs Hyperglycemia Hypoglycemia is low blood sugar; hyperglycemia is high blood sugar. IBS vs IBD IBS is irritable bowel syndrome — a functional condition with no visible bowel damage. Lupus vs Fibromyalgia Lupus is an autoimmune disease that damages organs; fibromyalgia is a chronic pain condition without organ damage. Migraine vs Headache A headache is a pain in the head. MRI vs CT Scan MRI uses magnets and radio waves; CT uses X-rays. Probiotics vs Prebiotics Probiotics are live beneficial bacteria; prebiotics are fibres those bacteria eat. Sprain vs Strain A sprain stretches or tears a ligament; a strain stretches or tears a muscle or tendon. Vegan vs Vegetarian Vegetarians avoid meat; vegans go further and avoid all animal products including dairy and eggs.