What Is Perimenopause?
Perimenopause is the transitional phase before the menopause (defined as 12 consecutive months without a period). During perimenopause, the ovaries are becoming less responsive to FSH, producing declining and erratic levels of oestrogen, progesterone, and testosterone. This hormonal instability — rather than simple oestrogen deficiency — is what drives the wide range of perimenopausal symptoms.
Perimenopause typically begins in the mid-to-late 40s and can last anywhere from 2 to 12 years. The average age of menopause in the UK is 51. Periods stopping before age 40 is premature ovarian insufficiency (POI) and requires different, prompt management.
Why FSH Testing Is Unreliable in Perimenopause
One of the most common and most consequential misconceptions is that a blood test can tell you whether you are perimenopausal. In women over 45, it cannot — and NICE guidelines are explicit about this.
Blood tests can still be useful to exclude other causes of symptoms (thyroid disease, anaemia, diabetes), but the perimenopausal diagnosis itself should rest on the clinical picture.
The 34+ Symptoms of Perimenopause
Perimenopause is associated with over 34 recognised symptoms. Many are not intuitively connected to hormones, which is why they go unrecognised for months or years.
Vasomotor symptoms
- Hot flushes
- Night sweats
- Palpitations
Psychological symptoms
- Brain fog and poor concentration
- Memory difficulties
- Low mood, depression
- Anxiety — often new onset
- Mood swings, irritability
- Loss of confidence
Physical symptoms
- Sleep disturbance and insomnia
- Joint and muscle aches
- Headaches and migraines
- Hair thinning
- Skin dryness, itching, or increased oiliness
- Weight changes, particularly central
- Fatigue
Urogenital symptoms
- Vaginal dryness and irritation
- Discomfort during sex
- Urinary urgency or frequency
- Recurrent urinary tract infections
- Reduced libido
Perimenopause often presents with a cluster of these symptoms — many of which, in isolation, might be attributed to stress, depression, thyroid disease, or simply "getting older." Recognition requires putting the whole picture together.
Treatment Options
The most effective treatment for perimenopausal symptoms is hormone replacement therapy (HRT). Modern HRT uses body-identical hormones — oestradiol and micronised progesterone — that are chemically identical to those your body produces. The risks of modern HRT have been substantially reassessed since the early 2000s, and for the majority of women under 60 who are within 10 years of menopause, the benefits outweigh the risks.
HRT options include:
- Oestrogen: delivered transdermally (patches, gel, or spray) or orally. Transdermal oestrogen is not associated with the small increase in blood clot risk seen with oral oestrogen.
- Progestogen: required in women with a uterus to protect the uterine lining. Available as separate tablets (micronised progesterone), patches, or the hormonal intrauterine system.
Non-hormonal options — including certain antidepressants, gabapentin, and oxybutynin — are available where HRT is not suitable or not preferred. Lifestyle approaches (regular exercise, sleep hygiene, limiting alcohol and caffeine) have a meaningful evidence base for symptom management.
Book a Perimenopause Consultation
A private perimenopause consultation at Lambert Medical Practice provides a thorough clinical assessment, discussion of the symptoms and their causes, and a personalised treatment plan. No referral is needed and same-week appointments are typically available.