Quick Answer. In some rare cases, excessive stress causes bleeding between periods. It is more common that another condition is responsible, such as pregnancy, polycystic ovary syndrome, infection, pelvic inflammatory disease or side effects of medication, according to WebMD.
Characteristics of Scientific Research. When researches progress to a certain degree, turning over to think about them in time will contribute to advance their process and make them develop healthily in correct direction. Therefore, let's have a look into the characteristics of our work macroscopically and generally.
Psychology can be classed as a science because it contains the same characteristics. An advantage of applying the scientific method to psychology is that researchers have increased control over the IV and can have standardized procedures, which increases the researches' reliability and replicablility. For e.g.