In the scenario you described, if a person who was born with one arm claimed that they actually had two arms, it would not be accurate to label it as a delusion. A delusion, as mentioned earlier, is a false belief that is firmly held despite overwhelming evidence to the contrary and is typically associated with certain mental health conditions.
In this case, it seems more like a misunderstanding or a subjective belief rather than a delusion. People can have varying perceptions of their own bodies, and this can be influenced by factors such as body image, personal experiences, and coping mechanisms. It's essential to approach such situations with sensitivity and respect for the individual's perspective.
If someone makes claims about their physical state that are not in line with objective reality, it is crucial to be compassionate and empathetic. It might be helpful to understand the reasons behind their belief and provide support or guidance if needed, but ultimately, medical and objective assessments should be made by qualified healthcare professionals.