Also known as paranoid schizophrenia, which is the best description of the early form, uncontrollable paranoia is a clear sign of the illness. This paranoia doesn't just mean having irrational thoughts and panic when they occur; it can be as irrelevant as feeling uncomfortable in certain situations without an actual cause. The constant feeling of being watched and the need to close every door is a clear sign of paranoia. Feeling observed more than you're supposed to when in public, thinking that every laughter in the vicinity is directed at ridiculing you is also caused by paranoia.
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