I'm in hospital, or I'm in the hospital

I'm in hospital, or I'm in the hospital: which is correct?

I came across these sentences while editing a manuscript for a client. The two sentences are grammatically correct, but are semantically (meaning) different.

📌 Firstly, I'm in hospital is used when you are a patient, that is, you are there—in hospital—to get some treatment. For example—a conversation between a son and his mother.

Mother: where are you, son?

Son: I had a car crash mom, so I'm in hospital to get treated.

📌 Secondly, I'm in the hospital is used to mean when a visitor, probably a relative or a friend, goes to visit the sick person in the hospital. For example, a conversation between a father and his first daughter.

Father: I just heard that your younger brother got injured in the car crash.

Daughter: that's true dad, I'm in the hospital to take care of him and pay for the hospital bills.

I'm hospital—used by patients in a hospital.

I'm the hospital—used by visitors in the hospital.

Happy New year, let's keep winning. ✨

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