Trouble with your upper leg? In this blog, you will read about the symptoms of an upper leg muscle tear . Muscles consist of bundles of fibres held together by connective tissue. In a muscle tear, those muscle fibres of the muscle are affected. The injury often occurs when a sudden movement is made. Thereby, intensive and frequent training in a short period of time is also a major cause. With short or stiff muscles and poor circulation, you are also more susceptible to a muscle tear.