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.
The innovative of the scientific research covers five levels which is sorted by the creativity extent : innovation with a new field , innovation with a new branch of a certain field ( new direction ) , innovation with a certain subject in a branch , innovation with the reinforcement and development of the original skills in a certain subject , ...