Periods and PMS – What’s Normal, What’s Not, and When to Seek Help

Periods can be one of the things that we just get on with, no matter how problematic they can be at times. Whether your remedy for painful periods is painkillers and hot water bottles or you just ‘carry on regardless’, the line between your body’s way of working and when something needs checking out isn’t always obvious. If you’re wondering whether what you experience each month is typical, you’re not alone, and it’s a question worth taking seriously.

What is a ‘normal’ cycle?

A typical menstrual cycle can last anywhere from 21 to 35 days, with bleeding usually lasting between 2 and 7 days. This range might seem wide, but that’s because cycles vary from person to person, and even from month to month for the same person. There are several factors which can have an impact too; stress, weight changes, travel, illness, and age to name a few.

Some mild discomfort is common during a person’s cycle; cramping can be a problem in the first day or two and sometimes bloating. Your breasts may feel more tender than usual, and mood changes in the days leading up to your period are all part of the usual PMS picture for many. But the key word is mild – noticeable and even annoying, but nothing that stops you living your life normally.

When PMS becomes something more

Premenstrual syndrome sits on a spectrum. For some people it’s barely noticeable but for others, the week or two before a period brings real disruption — irritability, anxiety, low mood, tearfulness, or physical symptoms severe enough to affect work, relationships, or sleep.

When these symptoms are severe, cyclical, and significantly affect daily functioning, it may point to premenstrual dysphoric disorder (PMDD), a more intense form of PMS that’s increasingly recognised and, importantly, treatable. The fact that symptoms are ‘only’ premenstrual doesn’t make them less valid or less deserving of support.

Signs your periods might need investigation

It’s easy to normalise things that have been part of your experience for years, especially if periods were always a bit heavy or painful. But certain patterns are worth paying attention to rather than working around:

• Very heavy bleeding — soaking through a pad or tampon every hour or two, passing large clots, or bleeding that regularly lasts longer than seven days
• Severe pain that isn’t controlled by over-the-counter painkillers, or that stops you going to work, school or doing your usual activities
• Irregular cycles — periods that are consistently shorter than 21 days or longer than 35, or that stop being predictable after being regular
• Bleeding between periods, after sex, or after menopause
• Missed periods for three months or more, if you’re not pregnant
• Sudden changes to a pattern that’s been stable for years
• Symptoms that get progressively worse cycle after cycle, rather than staying the same

Any one of these on its own doesn’t necessarily mean something is wrong. But they’re the kind of signals that warrant a conversation with a healthcare professional.

What might be causing the symptoms

There are several common, manageable causes behind heavier, more painful or less predictable periods, including:

• Fibroids — non-cancerous growths in or around the womb that can cause heavy bleeding and pressure symptoms
• PCOS (polycystic ovary syndrome) — often linked to irregular or absent periods, alongside other hormonal symptoms
• Endometriosis — where tissue similar to the womb lining grows elsewhere in the body, frequently causing significant pain
• Hormonal imbalances, thyroid conditions, or perimenopause, which can all affect cycle regularity

None of these should be self-diagnosed — investigations are needed to confirm any of these conditions. They’re common, well understood, and there are effective ways to manage all of them once identified.

Why it’s worth investigating

There’s a tendency to treat period problems as an inconvenience or an endurance rather than a health matter to be investigated. But heavy or irregular bleeding can affect iron levels and energy, and severe pain can point to underlying conditions like endometriosis that tend to be easier to manage the earlier they’re identified. Getting things checked isn’t about overreacting — it’s about managing something that probably has a straightforward explanation and a solution.

Getting the right support

If any of this sounds familiar, a good starting point is simply talking to someone. At Surrey Park Women’s Clinic, our gynaecology team sees these concerns regularly, and a consultation is often the quickest way to understand what’s going on. This could mean reassurance that everything is within a normal range, or a clear next step if it isn’t. We also offer same-day blood tests and ultrasound scanning, so if further investigation is needed, there aren’t weeks of waiting to find out more.

Tracking your cycle for a couple of months before your appointment (noting cycle length, how many days you bleed, pain levels, and any other symptoms) can make conversations much more useful. But you don’t need to have all the answers before you attend. That’s what the appointment is for.

Your periods are a useful piece of information about your overall health, not just a monthly inconvenience. If something about yours doesn’t feel right, it’s worth finding out why.