Multimorbidity means living with two or more chronic illnesses. For example, a person could have diabetes, heart disease and depression. Multimorbidity 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 multimorbidity has been increasing in recent decades. The high prevalence of multimorbidity has led to some describing it as "The most common chronic condition". Multimorbidity is also more common among people from lower Socioeconomic statuses. Multimorbidity is a significant issue in low‐ and middle‐income countries, though prevalence is not as high as in high income countries.