Hey guys, i was hopin if u can help me out. The last post i did on this area of the forum was regarding about having pain behind my knee. It turns out that i've been diagnosed with a strained hamstring. The only time that it hurts is whenever fully straighten my leg out and getting the worst pain from kneeling, bending the knee, and even trying to do a "checking" (muay thai term i think). And also this pain has been bothering me for 3-4 years now. Currently I'm seeing a therapist to help treat the pain. Is it possible for a strain to last that long? Is there any causes for the delay in the healing process of the strain?