seeing things that others can't see

If you know that you are seeing things that other people cannot see, eliminate anything in your lifestyle that can cause this. Causes could include alcohol consumption and the use of marijuana, cocaine, opiates or any other recreational drugs, as well as the use of prescription drugs used to excess.

If none of these are an issue and the hallucinations are causing you any kind of distress, see a doctor soon. Aside from substance abuse, many illnesses -- including but not limited to depression, bipolar disorder and schizophrenia -- can cause one to see things that are not real.