Delayed menstruation for ten days without pregnancy may be caused by ovarian endocrine dysfunction, abnormal thyroid function, or altered mental stress. 1. Ovarian endocrine dysfunction: the cause of ovarian endocrine dysfunction is related to ovarian dysfunction, medication or neuroendocrine dysfunction, etc. After the onset of the disease, the patient will have irregular menstruation, dysmenorrhea, and prolonged menstrual period. The treatment of ovarian endocrine dysfunction requires a detailed examination in the hospital to determine the cause of the disease and then take targeted treatment measures. 2. Abnormal thyroid function: Abnormal thyroid function will affect the normal function of the ovaries, and menstruation will become very irregular after ovarian dysfunction, and may be delayed for more than ten days. It is recommended that people with abnormal thyroid function go to the hospital for timely treatment. 3. Mental stress: High tension, long-term high pressure and other mental factors can lead to abnormal secretion of hormones by the hypothalamus, which can lead to delayed menstruation. Patients are advised to make mental adjustments and seek help from a psychiatrist if necessary. The delayed menstruation for ten days without pregnancy, there may be other reasons, it is recommended that the patient timely medical care, improve the relevant examination, clear the specific cause of the disease and active treatment.