We’ve all been there - watching the calendar, feeling the days tick by, and wondering why your period is taking its time to arrive.

Before you start to panic, it's important to know that a delayed period is more common than you might think, and it doesn't always mean something serious. In fact, there are several reasons why your cycle might be running late.

How long is the menstrual cycle?

The length of the menstrual cycle varies from woman to woman, but on average a regular cycle is every 28 days. For some women, it’s also common for a cycle to range from 23 days to 35 days.

Around 14-25% of women of childbearing age experience a delayed or missed period, and there are a number of causes.

9 possible reasons your period is late

While a missed or late period isn’t always a cause for concern, it’s important to keep track of your cycle and note any additional symptoms that might come with an irregular period. 

Here are 9 possible reasons your period is late.

1. Stress

Stress can seriously mess with your body, including your menstrual cycle. When your stress levels are high, your body produces cortisol, which can suppress the hormones needed to keep your cycle on track. So, if you’ve been feeling particularly anxious or overwhelmed, that might be why your period is delayed.

2. Changes in weight

Whether you've recently lost or gained weight, significant changes can impact your cycle. Rapid weight loss or a low body fat percentage can cause your periods to stop or become irregular. On the flip side, weight gain can lead to hormone imbalances that delay your period as well.

3. Over-exercising

While exercise is great for your health, overdoing it can actually throw off your menstrual cycle. High-intensity workouts can cause your body to produce less oestrogen, leading to a delay or even a missed period. 

Balance is key, so make sure to give your body enough time to rest and recover.

4. Hormonal imbalance

Hormonal imbalances, like those caused by polycystic ovary syndrome (PCOS), can lead to irregular or delayed periods. PCOS affects how your ovaries work and can result in missed periods or a complete lack of ovulation. 

If you suspect a hormonal imbalance, it’s a good idea to chat with your healthcare provider.

5. Birth control

Switching or stopping birth control can affect your menstrual cycle. Some forms of birth control, particularly hormonal options like the pill, can cause your period to be lighter, shorter, or delayed. It might take a few months for your cycle to return to its natural rhythm after stopping birth control.

6. Illness

Even if it's just a cold or flu, being unwell can cause your body to hit the pause button on your period. More severe illnesses or chronic conditions can have a more lasting impact on your cycle, so if you’ve been under the weather, this might be why your period is late.

7. Thyroid issues

Your thyroid gland plays a big role in regulating your menstrual cycle. If you have an overactive or underactive thyroid, it can cause your periods to be irregular or delayed. Thyroid issues can also lead to symptoms like fatigue, weight changes, and mood swings, so it’s worth a visit to your GP if you suspect this might be the case.

8. Pregnancy

Of course, one of the most common reasons for a delayed period is pregnancy. If there’s a chance you could be pregnant, it’s a good idea to take a test to find out for sure. Remember, it's possible to conceive even if you've used contraception, so it's worth ruling out.

9. Perimenopause

For those in their late 30s or 40s, perimenopause might be the reason behind a delayed period. This is the transition phase before menopause, during which your hormone levels start to fluctuate. Irregular periods are common during this time, and they can be delayed by days, weeks, or even months.

Remember, while a delayed period can be frustrating, it’s not always a cause for concern. However, if your period is consistently late or you’re experiencing other unusual symptoms, it’s a good idea to consult with your healthcare provider. They can help you pinpoint the cause and get your cycle back on track.

Stay calm, listen to your body, and don’t be afraid to seek advice if you need it. After all, your menstrual health is a vital part of your overall well-being!