Why does my hamstring hurt? The pain itself is pinpoint and random. It lasts for a few seconds, occurs while I'm stationary and only in my left leg. While not severe, it is distracting, especially while I'm at work. There are no marks, swelling or redness

You . You could have a tendonitis of the muscle attachment. This is usually relieved with medications such as advil, (ibuprofen) stretching, or physical therapy. The worst thing that could cause leg pain is a blood clot however, so if you had pain, swelling, or new symptoms then please be seen for a leg ultrasound.