Unwanted Loneliness: Impact on Health

Abstract

Unwanted loneliness is commonly defined as the perceived discrepancy between desired social relationships and those that are actually available. In recent years, it has emerged as a significant public health issue due to its growing prevalence and the substantial impact it exerts on individuals' physical, mental, and social health. Progressive population aging, increased life expectancy, and the rise in chronic illnesses and dependency have driven an increase in situations of social isolation and vulnerability, particularly among older adults¹.

Approximately one in six people worldwide experiences loneliness, leading the World Health Organization to recognize it as a global public health priority². In Spain, this phenomenon affects around 13.4% of the population, being more frequent among women and older adults¹. Likewise, several studies have shown that unwanted loneliness also affects young adults and socially disadvantaged groups, demonstrating that it is a transversal and multifactorial issue³.

The reviewed literature suggests that unwanted loneliness constitutes not only a negative emotional experience, but also a major health risk factor. Numerous studies have linked this condition to poorer general health status, a higher prevalence of depression, anxiety, cardiovascular diseases, functional decline, and increased premature mortality¹,⁴,⁵.

The consequences of this problem extend beyond the individual realm, generating a significant economic and social impact. This is due to increased healthcare utilization, pharmaceutical consumption, lost workplace productivity, and the need for long-term care⁶. Furthermore, social isolation among older adults has been linked to particularly severe phenomena, such as malnutrition, learned helplessness, and so-called "solitary death," observed more frequently in older men living alone with limited social support networks⁷,⁸.

For all these reasons, unwanted loneliness must be addressed as a priority public health issue requiring comprehensive, coordinated interventions across healthcare, social, and community domains.

The reviewed research underscores the need to develop public policies aimed at strengthening support networks, promoting social participation, improving psychological care, and advancing preventive strategies tailored to the needs of different population groups. In addition, it is essential to foster early detection programs and community-based interventions to reduce the impact of loneliness on the health and quality of life of affected individuals.

This bibliographic update aims to review and summarize some of the most relevant works recently published on unwanted loneliness, its impact on physical and mental health, and the proposed strategies for its detection, prevention, and intervention.