It\u2019s a classic horror movie trope: A person receives a hand transplant from a deranged killer, only to take on the dead donor\u2019s murderous characteristics.\nFortunately, such a terrifying tale is relegated to ghost stories \u2014 but there\u2019s a real medical condition that could make you feel like your hand is indeed possessed. Known as alien hand syndrome, this rare but troubling problem can cause your hand to move on its own.\nOut of Control: Symptoms of Alien Hand Syndrome\nIn alien hand syndrome, your hand moves without you being aware of what\u2019s happening or being able to control it.\nYou might find yourself reaching for something, moving objects, or making gestures without wanting to do so. You might even have to use your other hand to restrain yourself from moving. According to one recent news report, some people with alien hand syndrome even slap and punch themselves against their will. Although it\u2019s less common, a related disorder called alien limb phenomena can cause legs to move on their own.\nWhat Causes Alien Hand Syndrome?\nDespite the movements involved with alien hand syndrome, it isn\u2019t technically a movement disorder. Instead, it appears to occur as the result of some type of neurological damage. Common causes include:\n\nStroke\nTumors\nVarious neurodegenerative diseases\n\nAlthough rare, it\u2019s also possible to develop alien hand syndrome after brain surgery (to treat epilepsy, for example) or even during a severe migraine headache.\nA Helping Hand: Treatment Options for Alien Hand\nPhysicians have known about alien hand syndrome for more than a century, but it remains a challenging condition to treat.\nThere\u2019s some evidence that benzodiazepine medications and injections of botulinum toxin (BOTOX\u00ae) may help relieve symptoms. Behavioral strategies such as patient and caregiver education, coaching techniques, a\u00a0distraction of the affected hand, and cognitive behavioral therapy may also help.\nIt may seem like the stuff of science fiction, but for a small group of patients, alien hand syndrome is all too real. Learning about this rare disorder can help you better understand the challenges of people who have it.\nLearn more by visiting the UPMC Neurology Services webpage.