Irregular periods can be concerning and inconvenient. There are several potential reasons for an erratic menstrual cycle, ranging from lifestyle factors to medical conditions.

Here are 15 common causes:
- Stress: High levels of stress can disrupt the hormones responsible for regulating the menstrual cycle, leading to irregular periods.
- Weight Fluctuations: Significant weight loss or gain can affect hormone levels, which may cause changes in your menstrual cycle.
- Excessive Exercise: Intense physical activity can lead to changes in hormone levels and menstrual irregularities.
- Polycystic Ovary Syndrome (PCOS): A common endocrine disorder that can cause irregular periods, along with other symptoms such as weight gain, acne, and excessive hair growth.
- Thyroid Disorders: Both hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid) can disrupt menstrual cycles.
- Perimenopause: The transition period before menopause, known as perimenopause, often comes with irregular periods as hormone levels fluctuate.
- Birth Control: Hormonal contraceptives like birth control pills, patches, or intrauterine devices (IUDs) can cause irregular bleeding, especially when you first start using them.
- Breastfeeding: Prolactin, the hormone responsible for breast milk production, can suppress ovulation and lead to irregular periods.
- Medications: Certain medications, such as antipsychotics, antidepressants, and chemotherapy drugs, can affect menstrual cycles.
- Chronic Diseases: Conditions such as diabetes and celiac disease can impact menstrual regularity due to changes in hormonal balance and overall health.
- Hormonal Imbalances: Imbalances in hormones like estrogen and progesterone can cause irregular periods. This can be due to various underlying health issues.
- Uterine Abnormalities: Conditions like fibroids, polyps, or endometriosis can interfere with normal menstrual cycles.
- Eating Disorders: Anorexia, bulimia, and other eating disorders can disrupt hormone levels and menstrual cycles.
- Infections: Pelvic inflammatory disease (PID) and other infections of the reproductive organs can lead to irregular periods.
- Travel and Lifestyle Changes: Significant changes in routine, such as long-distance travel or changes in sleep patterns, can temporarily affect menstrual cycles.
If you experience persistent irregular periods, it is important to consult a healthcare provider to determine the underlying cause and appropriate treatment.