Late or missed periods can be caused by various factors, including hormonal imbalances, health conditions, lifestyle changes, and stress. Here are some of the most common reasons for delayed periods:

1. Hormonal imbalances: Hormone imbalances and health conditions are the most common reasons periods are irregular or late. PCOS, thyroid issues, and uterine scarring are some of the most common hormonal imbalances that can cause late periods.

2. Medications: Certain medications, including birth control pills, chemotherapy, and radiation therapy, can cause irregular bleeding and delay periods.

3. Stress: High levels of stress can interfere with the bodys delicate hormone balance, which can ultimately make periods late.

4. Weight changes: Severe changes in body weight, such as extreme increases or decreases in body fat, can lead to a hormonal imbalance that causes periods to come late or stop entirely.

5. Menopause: When the menopause transition starts, the cycle can become irregular, and periods can be late.

6. Polycystic ovary syndrome (PCOS): PCOS is a condition that causes the body to produce more of the male hormone androgen, leading to irregular ovulation or stopping it altogether.

7. Thyroid issues: An overactive or underactive thyroid gland can affect hormone levels and cause late or missed periods.

8. Uterine scarring: Uterine scarring can happen after a dilation and curettage (D and C) procedure, which can prevent a normal buildup and shedding of the uterine lining.

Its important to note that missed or late periods can also be caused by other factors, such as pregnancy, breastfeeding, sudden weight loss, excessive exercise, and certain medical conditions like heart disease and diabetes. If youre experiencing missed or late periods, its best to see a doctor to determine the underlying cause and receive appropriate treatment.