<unk>  means living with two or more chronic illnesses. For example, a person could have diabetes, heart disease and depression.<unk>  is common in older adults, estimated to affect over half of those aged 65 and over. This increased prevalence has been explained by older adults' "longer exposure and increased vulnerability to risk factors for chronic health problems". The prevalence of<unk>  has been increasing in recent decades. The high prevalence of<unk>  has led to some describing it as "The most common chronic condition".<unk>  is also more common among people from lower Socioeconomic statuses.<unk>  is a significant issue in low‐ and middle‐income countries, though prevalence is not as high as in high income countries.<unk>  is associated with reduced quality of life and increased risk of death. Due to the higher prevalence of<unk>  (55 - 98%), a new concept of "complex<unk>  (CMM)" has been proposed. CMM differs from the definition of conventional<unk>  in that CMM is defined by the number of body systems affected by the diseases rather than the number of diseases. CMM is associated is mortality and long-term care needs in older adults. People with<unk>  face many challenges because of the way health systems are organised. Most health systems are designed to cater for people with a single chronic condition. Some of the difficulties experienced by people with<unk>  include: poor coordination of medical care, managing multiple medications, high costs associated with treatment, increases in their time spent managing illness, difficulty managing multiple illness management regimes, and aggravation of one condition by symptoms or treatment of another.
Multimorbidity
Premorbidity
Comorbidity
Sedentary lifestyle
Genetic predisposition
Polypharmacy
Family history 
SAMPLE history