Acquired Disease: Definition and Clinical Context

What Is an Acquired Disease?

In medical terminology, an acquired disease is a condition that develops after birth as a result of environmental exposures, infections, lifestyle factors, trauma, or iatrogenic causes—as opposed to a congenital (present at birth) or genetic/hereditary disorder.

Key Distinctions

Category	Timing	Examples
Congenital	Present at birth (may be genetic or teratogenic)	Congenital heart defect, Down syndrome, cleft palate
Genetic/Hereditary	DNA mutation inherited or de novo	Cystic fibrosis, Huntington disease, sickle cell anemia
Acquired	Develops postnatally	Infections (TB, HIV), neoplasms, trauma, nutritional deficiencies, autoimmune diseases, drug reactions, radiation injury

Nuance: “Acquired” in Syndrome Descriptions

Some syndromes have both congenital and acquired forms (e.g., acquired immunodeficiency syndrome/AIDS vs. primary immunodeficiencies; acquired long QT syndrome from drugs vs. congenital long QT). The modifier “acquired” specifies the etiology.

Clinical Relevance

• Guides prevention (vaccines, safety, lifestyle).
• Informs prognosis (many acquired diseases are treatable/reversible).
• Affects insurance, occupational health, and public health reporting.