What does it mean when someone says they have "a complex"?

Question

Like if someone said to me...

"I'm starting to have a complex"

Answer 1

Many psychiatric problems are called "complex" (Oedipus Complex, Messianic Complex, persecution complex), and it just is a way to let the person know that you could easily go bonkers

Answer 2

Having issues with certain things.

Answer 3

That would mean they are starting to feel self-conscious about something. Like if they have been made fun of about something or people have made comments about something specific, then they would get a "complex" about that particular thing.

Answer 4

The word "complex" in this context was first used by Carl Jung.  His use was a bit more technical, but in common parlance a "complex" is a psychological condition, something less than outright mental illness but something other than perfect mental health.  Usually it has to do with ideas fusing together in what seem to be inappropriate ways.

Often, mild paranoia about a specific thing can be called a complex.  I have no real proof that my co-worker is out to get me, but some of the odd things I've overheard are starting to give me a complex.