Final answer:
A person with paralysis in one arm with no medically diagnosable cause would likely be diagnosed with a conversion disorder or functional neurological symptom disorder (FND). This diagnosis is made when neurological symptoms arise without a medical explanation and are possibly related to psychological stress.
Step-by-step explanation:
A person who has paralysis in one arm with no medically diagnosable cause might be diagnosed with a conversion disorder or functional neurological symptom disorder (FND). This condition involves neurological symptoms that can't be explained by medical evaluation and are believed to arise in response to psychological stress. Given the nature of the question, involving paralysis and its implications, the field of neurology and psychiatry would be involved in diagnosing and managing such a condition.
Paralysis is the loss of sensation and movement in a part of the body. In a case where there's no medically diagnosable cause, after physical causes like spinal cord injuries or upper motor neuron (UMN) or lower motor neuron (LMN) lesions are ruled out, a psychological factor might be considered.
It is essential to conduct a thorough assessment, including medical history and psychological evaluation, to arrive at a diagnosis of a conversion disorder or FND. Treatments typically focus on managing symptoms and addressing the underlying psychological stressors.