My menstruation postponed 13 days, went to a hospital to check blood, how to return a responsibility

Menstruation delay 13 days. If ruled out pregnancy, consider may be related to endocrine disorders, including long-term stay up late, overwork, emotional stress, depression, anxiety, or excessive diet, alcoholism, etc. may become incentives. In addition, do not rule out the possibility of diseases, such as chronic hepatitis, tuberculosis, tumors, etc.