When referring to physical therapy as a profession is it considered proper noun?

No, physical therapy is not considered a proper noun. It is a common noun that refers to a type of healthcare profession. Physical therapy is a healthcare profession that focuses on restoring and maintaining movement, function, and strength in people who have been injured or have a disability. Proper nouns are specific names for people, places, and things, such as "John Smith" or "New York City". Physical therapy is a more general term that describes a type of profession, so it is not a proper noun.