Negative mood - such as sadness and anger - may be a signal of poor health, a study claims.
Researchers from Pennsylvania State University in the US found that negative mood measured multiple times a day over time is associated with higher levels of inflammatory biomarkers.
This extends prior research showing that clinical depression and hostility are associated with higher inflammation.
Inflammation is part of the body's immune response to such things as infections, wounds, and damage to tissues. Chronic inflammation can contribute to numerous diseases and conditions, including cardiovascular disease, diabetes and some cancers.