Symptoms that cause distress but do not clearly fit into any diagnosis are best categorized as:

The correct categorization for symptoms that cause distress but do not clearly fit into any existing diagnostic criteria is termed "Unspecified Personality Disorder." This category is utilized in situations where the clinician chooses not to specify the reason that the criteria are not met for a specific personality disorder, despite the presence of distressing symptoms. This designation is particularly useful in clinical practice when professionals encounter complex presentations that don't align neatly with established categories in the DSM-5-TR or when there is insufficient information to make a precise diagnosis.

"Other Specified Personality Disorder" would imply that the symptoms fit the criteria for a disorder but don't meet all specific requirements, and the clinician provides a reason for that, which is different from being unspecified. "Paranoid Personality Disorder" refers to a specific diagnosis with clear criteria centered on pervasive distrust and suspiciousness of others. "Personality Change Due to Another Medical Condition" is characterized by significant changes in personality that are directly attributable to a medical condition, thus not relevant for symptoms that are distressing yet unclear in their categorization.

In summary, "Unspecified Personality Disorder" captures the essence of ambiguous symptoms causing distress without fitting neatly into other diagnostic categories.