How does your body have a false pregnancy?

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I dont understand how that works. Could you explain the following please.
1. What causes a false pregnancy?
2. What happens to your body?
3. What is the aftermath of such an experience?
Please and thank you.

False pregnancy is just all psychological
1. The woman wants so desperately to be pregnant that her body actually starts believing it is. Hysterical pregnancy can be caused by trouble conceiving for long periods of time or miscarriage.
2. A woman can actually stop her period in a hysterical pregnancy as well as bring on most of the symptoms a woman experiences while pregnant.
3. Denial would run rampant at first. But after the denial would most likely be devastation and depression, emotional distress, as hysterical pregnancies are for the most part caused by some form of loss.
Hope I helped at least a little.
Some women believe without a doubt they are truly pregnant. Their bodies secrete hormones to physically mock a real pregnancy. They start to have symptoms that normal pregnant women have and some even believe they feel the "baby" moving. The aftermath usually results in the woman realizing she is not pregnant (which is hard since this condition is mainly mental), and may lead to medication, therapy, etc. Usually pregnancy tests and/or an ultrasound are ways used to show the woman she is not with child. Hope this helped.