to feel anxious or concerned about something

चिंता करना

English Usage: She worries about her health more than she should.

Hindi Usage: वह अपनी सेहत की चिंता ज़्यादा करती है.

concerns or anxieties about something

चिंताएँ

English Usage: His worries about the exam kept him awake at night.

Hindi Usage: परीक्षा की चिंताएँ उसे रात भर जगाए रखती थीं.