Is seeing dead people an mental illness?

Not necessarily. Seeing dead people, or having visions of them, does not necessarily indicate a mental illness. It can be a symptom of a variety of factors, including grief, trauma, certain medications or drug use, or cultural or religious beliefs. In some cases, seeing dead people may be a normal part of the grieving process, or it may be related to spiritual or religious beliefs. However, if these experiences cause significant distress or impairment in daily functioning, it is important to seek professional help to determine the underlying cause and receive appropriate support or treatment.