What situations can lead to amenorrhea?

Patient's question:

My period should have arrived on the 9th of this month, but it has been delayed by 11 days and has not come yet. There are no abnormal symptoms, except that my lower abdomen is always wet. A pregnancy test showed negative. I would like to ask, besides pregnancy, what other possible reasons could cause this situation?
Onset and Duration of Symptoms: 7 days after the last period.
Current General Condition: Medical History: My periods are generally normal, except for occasional delays. However, this is the first time it has been delayed for so long!
Previous Diagnoses, Treatments, and Outcomes:
Auxiliary Examinations:
Other:
Follow-up Question: Thank you for your answer, but I would also like to ask what other conditions could lead to...

Doctor's answer:

Hello! The causes of amenorrhea include:
(1) Uterine amenorrhea:
1. Uterine hypoplasia
2. Endometrial damage
3. Endometritis
(2) Ovarian amenorrhea:
1. Congenital ovarian hypoplasia
2. Premature ovarian failure
3. Ovarian damage
4. Functional ovarian tumors
(3) Pituitary amenorrhea:
1. Pituitary damage-induced amenorrhea
2. Primary hypogonadotropic hypogonadism
3. Pituitary tumors
(4) Hypothalamic amenorrhea:
1. Excessive mental stress, fear, or anxiety
2. Psychogenic anorexia
3. Hypogonadotropic hypogonadism with galactorrhea
4. Polycystic ovary syndrome
5. Drug-induced amenorrhea
6. Malnutrition or wasting diseases
7. Hypothyroidism or hyperthyroidism, tumors, or diabetes can also cause amenorrhea.

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