SUMMARYDepressive illness in the elderly may be the result of a physical illness, the cause of secondary physical problems, coincidental to physical illness or the result of an aetiological factor common to both conditions. Analysis of a cross-sectional community sample of 396 elderly people showed depression to be significantly linked to presence of headaches, dyspnoea, and malignant disease known to the patient. It was not linked with heart disease nor arthritis per se, although those on anti-arthritic or analgesic medication were significantly more depressed. The subjective description of physical health given by the patient also correlated strongly with depression.Depressive illness is sometimes unrecognized and frequently untreated with a consequent reduction in quality of life for many patients. Clinicians must be aware of the possibility that depression may coexist with physical illness, and that both conditions may need appropriate treatment.Further analysis of the above sample, controlling for physical illness and the additive effect of the variables concerned, showed depression to be positively correlated with adverse social factors such as not going out because of physical disability, feeling lonely, having a shopper and having hearing difficulties. The home help service was identified as a probable protective factor, implying the importance of this service in supporting the emotional as well as the physical needs of its clients.KEY WORDS-Depression, elderly, physical illness, social factors, liaison psychiatry.Depressive illness is a relatively common disorder in the elderly. Community studies have shown prevalence of 11.5% (Copeland et al., 1987) to 26.2% (Kay et al., 1964); first admission rates for depressive illness reach a peak in the sixth and seventh decades (Post, 1976), although first diagnosis of the illness occurs with decreasing frequency after the age of 65. It thus appears that the more severe kinds of depressive illness are most frequently seen in the elderly (Post, 1982). In residential homes, prevalence reaches a worrying 40% (Ames et al., 1988) and in home-care and sheltered