(Concern) I have been experiencing knee pain lately. I'm unsure whether I should go to the hospital.

I served in the military as an engineer and did heavy physical labor for two years. I lifted a lot of heavy objects, and by the time I was discharged, my knees were sore. But over time, the pain has come back. Even lifting something slightly heavy causes knee pain. It’s becoming inconvenient in my daily life, so I want to get treatment, but I’m unsure whether I should go to the hospital. Somehow, I feel like there might not be a specific treatment even if I go. Should I take some medication that’s good for joints?