Does HRT cause weight gain? What the trials show
HRT does not cause weight gain, according to a Cochrane review of 28 trials. Here is why it can feel that way in the first weeks and what does drive midlife weight.
Hormone therapy (HRT)
What hormone replacement therapy does, the forms it comes in and how to weigh its benefits against its risks.
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Guides in this topic
HRT risks in plain numbers: extra cases per 1,000
The pros and cons of hormone replacement therapy as extra breast cancer, clot and stroke cases in a group of 1,000 women, by type, route and years.
Menopause symptom checklist for your GP
Tick perimenopause and menopause symptoms, how often each one hits and how much it bothers you, then print one sheet before a GP visit about hormone therapy.
Hormone therapy (HRT): the overview
Hormone replacement therapy (HRT, called MHT or hormone therapy in the US) replaces the oestrogen your ovaries stop making. If you still have a womb, it is paired with a progestogen to protect the womb lining. Oestrogen can be taken as a patch, gel, spray or tablet, and there are low-dose vaginal forms for dryness and urinary symptoms (the NHS guide to HRT).
What the guidelines say
NICE's 2024 update calls HRT the most effective treatment for hot flushes and night sweats, and finds it unlikely to change overall life expectancy. It also says HRT should not be started to prevent heart disease or dementia (NICE, November 2024).
The Menopause Society's 2022 position statement reaches a similar place: for healthy women with symptoms who are under 60, or within ten years of their last period, the benefits generally outweigh the risks. Started later, the balance is less favourable. Risk depends on the type, the dose, how it is taken, for how long, and whether progestogen is part of the prescription (Menopause, 2022).
What the guides here cover
The articles in this topic go through the forms of HRT, what "body-identical" and "bioidentical" mean, breast cancer and blood clot risk in plain numbers, side effects, how long it takes to work, and how to ask for it. The first one answers a worry that stops many women starting: whether HRT causes weight gain.
Before that conversation, the symptom checklist is a way to show which symptoms are bothering you, and how often.
Ines Kovac's view: go into the appointment with your own risk factors written down (family history, migraines with aura, past clots, smoking). The decision turns on those far more than on headlines.
Questions readers ask
Is HRT safe?
For most healthy women under 60 with symptoms, major guidelines say the benefits outweigh the risks. Your own history decides it, so it is a conversation for your doctor.
What forms does HRT come in?
Patches, gels, sprays and tablets for oestrogen, with the womb-protecting hormone given as a tablet or a coil, plus vaginal creams, pessaries and rings for local symptoms.
Does HRT prevent heart disease or dementia?
NICE says it should not be started for that purpose. It is prescribed for symptoms, and it also protects bone.
Other topics
- PerimenopauseWhen cycles start to change: the first signs, how long this stage lasts and how it gets diagnosed.
- SymptomsBrain fog, anxiety, aches and the less-talked-about changes, with what each one usually means.
- Hot flashesWhy the heat comes on, and the treatments with real evidence, hormonal and not.
- SleepWhy sleep breaks down in perimenopause and menopause, from sweating at night to 3am waking, and what helps you stay asleep.
- Weight and dietWhat really changes with weight at midlife, and how to eat for energy, bones and heart.