Hello. I am a 25 year old girl. I am experiencing some pain in the back of my left thigh. I was sick and in bed for some days, and after that I ve spent a lot more time in bed studying for my exams. I ve had the pain before, but never as persistent as now and never this bad. In general I sit down a lot (play computer games, and sitting a lot at school in classes as well) but I got a dog two months ago and have had daily walks besides this last week and a half. The pain is faint when I stretch my left foot, but if I curl the knee up towards my belly I can feel it very well. When I hold the knee still in the curled up position, there is no pain. The pain is not severe, more discomfort and sometimes interfer with my activities. I use a nicotine product called snus , you put this bag of tobacco under your lip. I use birth control pills, but I ve have been taking them irregulary lately due to forgetting due to stress and a busy schedule. I try to make systems where I remember them, but I often end up forgetting one now and then :( Just wondering about the possible causes for this issue, if it will go away once I become active again or if it could be caused by something where I need to go to my doctor for help. Thanks!