Schizophrenia most commonly starts when a person is in their 20s. It might begin with delusional thoughts, such as the belief that other people are watching you. Or you may start to see meaning behind little coincidences that occur throughout the day, building a sense of paranoia. Often, you’ll experience auditory hallucinations, such as hearing the voices of people who aren’t around, or visual hallucinations, such as seeing unexplained movement in your peripheral vision. Depression and intense anxiety can also develop alongside these symptoms.