I workout daily at 4am but for the past couple weeks I notice when I do my cardio my left knee has been bothering me. I took a picture of my knees last week and I see that my left knee is swollen compared to my right. Yesterday, I had leg day and my workout went fine until I did my cardio and ran the treadmill. I've been noting that the pain only happens when I get on the treadmill. Yesterday at work, a sharp pain came in and I notice my knee is more tender and swollen than normal and I actually had a hard time walking yesterday. Last night I placed a icy hot back patch on it but the swelling and pain is worse today. Your thoughts please. I hope I didn't tear anything.