What term describes an illness that develops slowly over time?

The term that describes an illness that develops slowly over time is "chronic." Chronic illnesses typically have a gradual onset and can persist for an extended period, often lasting three months or more. These conditions can fluctuate in intensity but generally remain present over time, requiring ongoing management and care.

Chronic illnesses include a wide range of health issues, such as diabetes, hypertension, or arthritis. Understanding this terminology is crucial in the healthcare field, as it helps in planning long-term patient care and monitoring for complications.

By knowing that an illness is chronic, healthcare providers can adopt a proactive approach to treatment and lifestyle modifications, which may ultimately lead to better health outcomes for patients.