A typical menstrual cycle lasts anywhere from 21 to 35 days, with bleeding lasting three to seven days. Every woman has her own pattern, and some variation from cycle to cycle is entirely normal. A menstrual irregularity is when your pattern shifts significantly — cycles become unpredictable, bleeding is unusually heavy or scanty, or you experience bleeding at unexpected times. While many causes are harmless, some require medical attention and early diagnosis makes a real difference.
Common Types of Menstrual Irregularities
- Irregular cycles: The time between periods varies considerably, making it difficult to predict when the next one will arrive.
- Amenorrhoea: The complete absence of periods for three or more months in someone who is not pregnant and has not yet reached menopause.
- Hypomenorrhoea: Very light bleeding or a cycle that lasts only one to two days.
- Menorrhagia: Unusually heavy bleeding lasting more than seven days, or needing to change a pad or tampon every hour for several consecutive hours.
- Dysmenorrhoea: Severe cramping that significantly interferes with daily activities.
- Intermenstrual bleeding: Spotting or bleeding that occurs between periods.
What Can Cause Menstrual Irregularities?
The causes range from lifestyle factors to underlying medical conditions:
- Stress and psychological pressure: Chronic stress disrupts the hormonal axis that regulates the cycle. This is one of the most common and underrecognised causes.
- Significant weight changes: Both rapid weight loss and obesity can disturb hormone levels and disrupt cycles.
- Intense exercise: Extreme physical training — common among athletes — can reduce or stop periods entirely.
- Polycystic ovary syndrome (PCOS): A very common hormonal disorder that frequently causes irregular or absent periods, often accompanied by acne and unwanted hair growth.
- Thyroid dysfunction: Both an overactive thyroid (hyperthyroidism) and an underactive thyroid (hypothyroidism) can significantly affect cycle regularity.
- Uterine fibroids or polyps: Non-cancerous growths that can cause heavy bleeding, prolonged periods, or intermenstrual spotting.
- Endometriosis: A condition where tissue similar to the uterine lining grows outside the uterus, causing severe pain and potentially affecting fertility.
- Perimenopause: As women approach menopause, cycle patterns often become less predictable before periods stop altogether.
Warning Signs That Require Medical Attention
Some variation in your cycle is normal, but see a gynaecologist if you experience:
- No period for more than three months (when pregnancy has been ruled out).
- Very heavy bleeding — soaking through a pad or tampon every hour, or periods lasting longer than seven days.
- Severe cramping that stops you from working, studying, or carrying out daily activities.
- Bleeding after sexual intercourse.
- Spotting or unusual discharge between periods.
- Accompanying symptoms such as extreme fatigue, significant hair loss, or unexplained weight gain or loss.
Diagnosis and Treatment
Your doctor will take a detailed menstrual history and perform a pelvic examination. Depending on findings, further investigations may include a pelvic ultrasound, hormone blood tests, thyroid function tests, or other targeted assessments. Treatment depends entirely on the underlying cause and can range from lifestyle modifications and medication to minimally invasive procedures in some cases.
Irregular periods are not something to ignore or hope will resolve on their own. At Ky Hoa Medical Center, our experienced gynaecologists and modern diagnostic equipment are ready to help identify the cause of your symptoms and create a personalised treatment plan. Taking charge of your reproductive health is one of the most important investments you can make in your overall well-being.