5 reasons for delayed periods when you aren't pregnant:

1. Stress: Stress can disrupt the hormones that regulate your menstrual cycle, leading to late or missed periods. Chronic stress can also affect your sleep, diet, and exercise habits, all of which can contribute to irregular periods.
2. Weight changes: Significant weight loss or gain can also disrupt your menstrual cycle. Losing too much weight can reduce your body fat percentage, which is needed to produce the hormones that regulate menstruation. Gaining too much weight can lead to hormonal imbalances, which can also cause irregular periods.
3. Polycystic ovary syndrome (PCOS): PCOS is a common hormonal disorder that can cause a variety of symptoms, including irregular periods, acne, excess hair growth, and weight gain.
4. Thyroid problems: The thyroid gland produces hormones that regulate metabolism and other bodily functions. An overactive or underactive thyroid can disrupt your menstrual cycle, leading to late or missed periods.
5. Perimenopause: Perimenopause is the transition period leading up to menopause, which typically occurs between the ages of 45 and 55. During perimenopause, your hormone levels start to fluctuate, which can cause irregular periods.

Other possible causes of delayed periods include:

• Birth control
• Certain medications
• Illness
• Travel
• Breastfeeding

If you're not pregnant and your period is more than a week late, it's important to see a doctor to rule out any underlying medical conditions.

Here are some tips for managing delayed periods:

• Manage stress levels through exercise, relaxation techniques, and getting enough sleep.
• Maintain a healthy weight and eat a balanced diet.
• Talk to your doctor about any medications you're taking that could be affecting your menstrual cycle.
• See a doctor regularly for checkups and screenings.