Hi, I am a 25 year old male with no knee problems before, but recently I ran on the treadmill for 30mins and during the workout my knee was hurting a bit. After the workout I noticed that I there is some pain when I bend my knee fully but there is no swelling and I can walk perfectly fine with no pain. Can someone please tell me if this pain is serious and how long will it take for the pain to heal? Also, what can I do to make my knee feel better? Thanks