Talk to Orthopedic Surgeon on Sharp Knee Pain

Hello Doctor, I’d like to get my left knee assessed.

I have had pain under my left kneecap for quite some time, but because I wasn’t exercising regularly, I didn’t notice it much. I recently started working out and have completed around 3–4 leg workouts.

Yesterday, I did leg extensions, hack squats, and leg press without experiencing any pain during the workout. Today, when I tried doing lunges, I felt a sharp pain directly underneath the left kneecap, almost like the tendon was being twisted or placed under excessive stress. Because of the pain, I had to stop the exercise

At rest, I currently have no pain. However, I expect the pain to return when I perform squats or lunges. I have not mentioned any major injury or trauma to the knee.

What could be the reason or is it serious? Or how can i treat it by doing some strengthening exercises?