The causes of vague pain in the left breast above the breast are generally divided into physiological factors and pathological factors. 1. Physiological factors: physiological factors caused by breast pain, usually occur before the onset of menstruation, due to the hormone levels in the female body fluctuates greatly, so there will be corresponding symptoms of discomfort, the most common is breast pain, may also appear abdominal distension. 2. Pathological factors: The pathological factors that cause breast pain are generally considered to be the presence of lesions in the breast area, such as mastitis, breast cysts, breast hyperplasia or breast cancer, and further imaging tests are needed to make a clear diagnosis. If the pain is caused by physiological factors, there is no need for special treatment, and the pain will be gradually relieved and subside after menstruation. If it is caused by pathological factors, you need to go to the hospital in time to receive targeted treatment.