According to the Catholic Church, it is generally not appropriate for Catholics to receive Holy Communion more than once per day. This is because Holy Communion is considered to be a special and intimate encounter with Jesus Christ, and it is meant to nourish and strengthen Catholics in their faith.
The Church teaches that Holy Communion is the “source and summit” of the Christian life, and it is an important part of the Mass, the central act of worship in the Church. Therefore, it is recommended that Catholics participate in the Mass and receive Holy Communion as frequently as possible, in order to grow in their relationship with Jesus Christ and to receive the grace and spiritual nourishment that Holy Communion provides.
However, there are some exceptions to this general rule. For example, if a Catholic is unable to participate in Mass on a given day, they may be permitted to receive Holy Communion more than once in order to make up for this missed opportunity. Additionally, in some cases, Catholics who are in a state of serious illness or spiritual need may be permitted to receive Holy Communion more frequently in order to receive the special graces and spiritual nourishment that Holy Communion provides.
It is important to note that these exceptions are rare and should not be seen as a general rule. In general, Catholics are encouraged to participate in the Mass and receive Holy Communion as frequently as possible, but not more than once per day.