Most women with fibroids are told to “watch and wait.” Fine advice — but only useful if you know what you are actually watching for. The signs that fibroids are progressing are specific, and catching them early means more treatment options, less damage to manage, and a much clearer conversation with your gynaecologist.
1. Your Periods Are Getting Heavier — Consistently, Not Just One Bad Month
A single unusually heavy period can happen for many reasons. Two or three in a row, with a clear pattern of escalation, is different. If you are going through protection faster than six months ago — soaking through a pad or tampon in under an hour, passing clots you did not used to pass, or finding that what was once a heavy-but-manageable period is now requiring doubled-up protection — that is meaningful data.
Submucosal fibroids growing into the uterine cavity directly increase the endometrial surface area, which means more lining to shed each cycle. As they grow, the impact compounds. Many women find their periods change gradually enough that they adjust their habits without registering the change as significant. Looking back at what a “normal” period was three years ago versus now can be genuinely clarifying.
2. You Are Passing Larger Clots
Small clots (smaller than a 50p coin or a grape) during heavy flow are common. Clots that are larger, more frequent, or appearing at times they did not before are worth noting. Large clots form when blood pools in the uterine cavity before it can be fully expelled — a pattern associated with fibroids that are disrupting normal uterine contractions.
Some women describe passing clots so large they are visibly alarming. If this is happening regularly, it warrants a conversation with your doctor and a blood count to check for anaemia — because heavy clotting and heavy flow over time will deplete your iron stores even if you do not feel obviously unwell yet.
3. Pelvic Pressure That Was Not There Before
This one is insidious because it develops slowly. A persistent feeling of pressure, weight, or fullness in the lower pelvis — not period pain, which is cyclical — but a constant baseline of heaviness that was not there a year ago. It can feel like you always need to use the bathroom, or like something is sitting in your pelvis.
This symptom reflects fibroids growing large enough to physically press on surrounding structures. Subserosal fibroids (on the outer wall of the uterus) are the most common culprit, but significant intramural fibroids can cause it too. The fact that this symptom tends to emerge gradually means women often do not notice how much it has changed until they try to remember what it felt like before.
4. Needing to Urinate More Frequently — Especially at Night
Fibroids pressing forward on the bladder reduce its functional capacity. The bladder fills to what feels like capacity but is physically compressed — so you feel the urge to urinate more frequently, with less actual volume each time. Waking two or three times per night to urinate when you previously slept through is a specific flag.
This symptom is easy to attribute to other things — drinking more water, ageing, a minor infection. But if it has developed alongside any other items on this list, fibroids pressing on the bladder is the more likely explanation. An anterior fibroid (on the front wall of the uterus, closest to the bladder) is particularly associated with urinary frequency.
5. Your Period Is Lasting Longer
A normal period lasts 3–7 days. If yours has crept from 5 days to 8, or from 7 to 11, that is a measurable change — not a vague impression. Prolonged periods, particularly when combined with heavier flow, put you at real risk of iron deficiency anaemia even if your haemoglobin has not dropped to clinically significant levels yet. Low-normal haemoglobin still means fatigue, reduced exercise capacity, and impaired concentration.
Worth keeping a simple period tracker if you do not already. The data is genuinely useful — both for your own awareness and for medical appointments where “my periods have gotten longer” is much less useful than “my periods were 6 days in 2024 and are now consistently 9–10 days.”
6. Pain That Did Not Exist Before — Or Pain That Has Moved
New pelvic pain between periods, or pain that has changed in character, location, or intensity, warrants investigation. Fibroids themselves do not have nerve endings — they do not cause pain directly — but they cause pain indirectly: by pressing on pelvic nerves, by causing the uterus to contract against resistance, or by undergoing degeneration (when a fibroid outgrows its blood supply, which is acutely painful and comes with localised tenderness and sometimes low-grade fever).
Pain during sex that is new or worsening is also relevant. Deep dyspareunia — pain felt deep in the pelvis rather than at the surface — often reflects fibroids pressing on structures that are mobilised during intercourse. It is frequently under-reported because of embarrassment, but it belongs in the conversation with your doctor.
7. Visible Abdominal Changes
A uterus enlarged by significant fibroid burden can cause visible lower abdominal protrusion. Women sometimes describe it as looking permanently bloated, or as a firm swelling below the navel that does not fluctuate with meals or time of day. If you can feel a firm mass in your lower abdomen when you press gently — particularly if it is slightly asymmetric — that is a fibroid that has grown large enough to be palpable.
This is also something a GP can detect on physical examination before imaging. If you have noticed a change in the shape of your lower abdomen that you cannot explain otherwise, mention it at your next appointment and ask for a pelvic examination and ultrasound.
What To Do When You Notice These Signs
The most useful single action is to book a GP appointment and request a pelvic ultrasound. Ultrasound is the gold standard for assessing fibroid size, location, number, and — when compared to a previous scan — growth rate. Go to that appointment with as much specific information as possible: how your periods have changed, when the pelvic pressure started, what your pain pattern looks like.
A full blood count to check haemoglobin and ferritin is also worth requesting — particularly if heavy or prolonged periods are part of your picture. You can have significant iron depletion without being clinically anaemic, and catching it early is far easier than dealing with overt anaemia later.
For the lifestyle side of managing a worsening picture, see our guide on natural fibroid management strategies and our complete fibroid diet guide. These are most valuable when you start before symptoms become severe — but they are still worth implementing at any stage.
