to cause worry to someone The state of my father's health concerns us greatly. [ + that ] It concerns me that he hasn't been in contact. The subject is that something that you are worried about. [Something] is concerning me It concerns me that [whatever] You can also use the adjective concerned in the way that Astralbee has suggested More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.