While most of us have heard about the most common mental disorders such as obsessive compulsive disorder, there are a number of unusual psychological conditions that are neglected by virtue of the fact that they are rare.

Here are some mental disorders you don’t know existed

Walking corpse Syndrome

Walking corpse syndrome is a belief felt by a person, that she is actually dead or doesn’t exist. It has been linked to depression or those who are chronically deprived of sleep.

Erotomania

Those who suffer from this mental disorder hold a delusional belief that a person generally from a high social status (like a celebrity) is madly in love with them and making advances towards them through special glances, signals or messages through media. The scary part of this disorder is that the patient’s feeling is so overwhelming that even when the person directly denies any sentiment of affection, the other remains unconvinced.

Alien hand syndrome

Alien hand syndrome occurs when a person’s hand appears to move involuntarily or grab hold of things without the cognitive control of the person to whom the arm belongs. It is caused by a conflict between the left and right parts of the brain or mixing of damaged brain wires.

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