When do the words physical therapy need to be capitalized?

The words "physical therapy" should be capitalized when they are used as a proper noun. For example, they would be capitalized in the following contexts:

* The Physical Therapy Department at the hospital is offering free screenings this week.

* My doctor recommended that I see a physical therapist to help with my back pain.

* I am studying to become a physical therapist.

However, if the words "physical therapy" are used in a general sense, they do not need to be capitalized. For example:

* I am going to physical therapy twice a week.

* Physical therapy has helped me to improve my range of motion.

* I am grateful for the physical therapy that I received.