Homesickness is a feeling of longing for a place or person that one is familiar with. It is often associated with NOSTALGIA, which is a sentimental longing for the past. Homesickness can be caused by being away from home for an extended period of time, such as when travelling or living away from family and friends. It can also be caused by changes in one's life, such as moving to a new city or starting a new job. Homesickness can lead to feelings of sadness, loneliness, and anxiety.