Early Signs of Perimenopause

Early in the transition, menstrual cycles can shorten. If your period has reliably arrived about every four weeks, a run of earlier periods may stand out. Later, the gap between periods can become less predictable, with longer cycles and occasional missed periods. Bleeding can also change in amount or duration.

Cycle length is measured from the first day of one period to the first day of the next. Record those dates for several months. A single unusual cycle can happen for many reasons; a recurring change helps a clinician assess what is happening.

The international STRAW+10 staging system describes the early menopause transition using a recurring difference of at least seven days between consecutive cycle lengths. This is a clinical staging guide. It works best when periods have previously been regular and are visible without hormonal treatment changing the bleeding.

If your cycles have always been irregular, or you use a pill, implant, injection, or hormonal IUD, explain that at your appointment. Bleeding alone will give less information about ovarian changes. A missed period also warrants a pregnancy test when pregnancy is possible.

A hot flash usually starts as sudden warmth across the face, neck, or chest. It may pass with little sweating, or bring flushing, a racing heartbeat, and a chill afterward. Episodes commonly last one to five minutes. A new need to remove a layer during an ordinary activity may be your first recognizable symptom.

At night, you may wake hot or sweaty and then struggle to return to sleep. Notice whether the room is warm, whether you are actually sweating, and whether similar heat episodes occur during the day. Sleep can also become unsettled during perimenopause without obvious night sweats.

A few poor nights are common at any age. Repeated waking, especially alongside a changing cycle or daytime hot flashes, is useful information to bring to a clinician. Treatment can begin during the years when you still have periods.

Some women describe a shorter temper, anxiety that feels unfamiliar, or more difficulty concentrating. Others lose their train of thought or search for words more often. Hormone fluctuations may contribute, while disrupted sleep, stress, medication, and existing mood conditions can affect the same symptoms.

Record what is different in daily life: rereading work, avoiding a meeting because of anxiety, or feeling persistently low. Include when it began and whether it follows poor sleep or a particular part of your cycle. A clinician can assess menopause symptoms and mental health together.

Seek help when anxiety or low mood is affecting your work, relationships, or ability to care for yourself. A symptom diary can support that discussion, but you can book an appointment as soon as you need care.

Perimenopause usually starts in the mid to late 40s, although timing varies. For an otherwise healthy person aged 45 or older with new hot flashes and cycle changes, NICE recommends identifying perimenopause from the history without routine hormone blood tests. Tests may be useful at younger ages or to investigate another cause.

Use a calendar, notes app, or paper. Focus on a few details you can reliably record. An elaborate symptom score is unnecessary for a useful first appointment.

• Period start dates, number of bleeding days, and any spotting between periods.
• Heat episodes or night sweats, including how often they wake you.
• Changes in mood, focus, or vaginal comfort that interfere with daily life.
• Current medications, supplements, and contraception, including recent changes.

Bring previous cycle dates if you already have them, and explain your main concern in concrete terms. For example, waking drenched three nights a week gives a clinician more to work with than a general description of feeling hormonal.

Contact a clinician about bleeding between periods, after sex, longer than seven days, or much heavier than your usual flow. Fibroids and polyps can cause bleeding changes, and heavy bleeding can lead to anemia. Evaluation may include a blood count, examination, ultrasound, or a sample of the uterine lining, depending on your age and symptoms.

A thyroid condition can also resemble parts of perimenopause. An underactive thyroid may cause fatigue, feeling cold, weight gain, and heavy or irregular periods. An overactive thyroid may cause sweating, tremor, palpitations, and weight loss. Mention these combinations so a clinician can decide whether thyroid testing is appropriate.