Last Updated: October 21st, 2026
Reading Time: 11 mins
Starting HRT often raises one worry straight away: is what I am feeling normal? Most HRT side effects are mild and settle within the first weeks, but some need a change of dose, route or type. This guide explains what is usually expected, how long it lasts, and the signs that mean a review is needed. It will help you tell the difference between settling in and something that should not be left.
Key takeaways
Picture a woman in her early fifties, ten days into her first patch. Her hot flushes have eased, but her breasts feel tender and she has a dull headache most afternoons. She wonders whether to stop. That is a very normal moment, and it is where most conversations about side effects start.
Many women have no side effects or only mild ones. When they do appear, they come from the oestrogen, the progestogen, or both. Oestrogen is linked with breast tenderness, headaches and nausea. Progestogen is linked with changes in periods, acne, and tiredness or dizziness. That is why hormone replacement therapy side effects in women vary so much: the type, dose and route all change what you feel.
Side effects are not a sign that HRT is wrong for you. They can simply mean the body is adjusting. We usually advise sticking with treatment for around 3 months where possible, because early symptoms tend to fade.
Route matters as well. Oestrogen can be taken as a tablet, a patch, a gel or a spray, and the same dose can feel different in each form. A woman with skin irritation from a patch may prefer a spray or gel. The progestogen part, which protects the womb lining in women who still have a uterus, can also come as a tablet or from a hormone coil fitted in the womb. It can take a few tries with different brands and methods to find the one that suits you. That flexibility is the main reason side effects can usually be fixed without giving up on HRT.
The first weeks tend to bring a familiar group of complaints. HRT side effects women mention most often include:
Weight gain, backache and skin irritation are also reported. Weight gain may not be caused by HRT at all, because menopause alone shifts weight and fat distribution. Most of these are mild and temporary. A symptom that is severe, or that is still there after 3 months, is the point at which we change something.
Mood deserves a separate mention. Some women feel low, irritable or tearful in the first weeks, particularly with the progestogen part of combined HRT. Others notice better sleep and a steadier mood as flushes settle. If low mood is new, strong, or lasting, say so at your review, because changing the type or route of progestogen is a common adjustment. Breast tenderness is similar: it is usually mild and settles, but any new lump, skin change or nipple discharge needs an examination and should not be put down to HRT.
The HRT side effects menopause brings are not the same at every stage. In perimenopause, hormone levels still swing, so your own hormones and the added HRT can both be adding to how you feel. Cyclical HRT, which gives a regular monthly bleed, can also bring back premenstrual-type symptoms in the progestogen phase. After menopause, hormone levels are steadier, so side effects are more likely to be linked to the dose, the route or the type of HRT itself.
If periods are still happening, noting the day of your cycle alongside each symptom helps us tell cycle changes from medicine effects. A note on your phone is enough: the date, the symptom, how strong it was from 1 to 10, and whether you took your HRT that day.
Patches release oestrogen through the skin, so they avoid the first pass through the liver that tablets go through. Many women prefer them for steady levels and ease of use. The side effects overlap with other forms: breast tenderness, headaches and nausea can all happen. HRT side effects patches add one extra group, which is skin reactions where the patch sits.
Tablets can slightly raise the risk of blood clots, although the risk is still very low, while patches, sprays and gels do not. Women at higher risk of clots are usually advised to use a patch, spray or gel rather than tablets. That is one reason many women are offered patches first. Risk still depends on the individual, so it is part of the discussion at a consultation.
Practical points that help most women:
Itching under the patch is a common worry, and HRT patches side effects itching usually has a simple explanation. Mild redness or itching under a patch can come from the adhesive, from sweat or heat trapped under it, or from reusing the same patch of skin too soon. Most mild reactions settle when the site is rotated and the skin is dry before applying.
A rash that spreads, blisters, or does not settle should be reviewed. We can change the patch type, switch to a gel or spray, or move to another route, so there is no need to put up with ongoing irritation.
Two other patch problems are worth knowing about. A patch that keeps peeling off, especially after a hot shower or swim, may mean the site needs changing, and uneven levels can bring symptoms back. Symptoms that return in the last day or two before a patch change can point to a dose that is not quite enough. Both are simple to raise at a review.
Anyone searching HRT patches side effects weight loss may be hoping the patch will help with weight, so it is better to be direct. HRT is not a weight-loss treatment, and patches are not expected to make you lose weight. Weight changes at this stage usually come from age, activity, sleep and the shift in fat storage towards the waist.
Weight gain is listed as a possible early effect of HRT, but it may not be caused by HRT, and water retention can occur. If fluid is the issue, a different preparation may help.
If you are losing weight without trying, that is a separate matter and needs checking whatever treatment you are on. Our post on menopause weight gain covers the weight side in more depth, and our menopause weight management support looks at the wider picture.
For most women they ease within weeks. Guidance varies slightly on the exact window, from 6 to 8 weeks up to about 3 months, and we usually advise giving treatment around 3 months where possible. So how long do HRT side effects last in practice? Usually a few weeks, sometimes up to about 3 months.
| Side effect | Usual pattern |
| Nausea, headache, breast tenderness | Usually settle within the first few weeks |
| Bloating and fluid retention | Tend to settle within weeks, may need a change of type if not |
| Skin irritation from patches | Usually improves with site rotation, review if it spreads |
| Irregular bleeding | Common in the first few months, usually settles within 6 months |
| Any symptom still severe or present at 3 months | Needs a review and likely a change |
The pattern matters more than the label. A symptom that is easing week by week is usually just settling. One that is unchanged or worse after 3 months tells us the current HRT is not the right fit, which is useful information, not a failure.
While you wait for things to settle, a few habits help. Take tablets at the same time each day and keep to the same change day for patches. Do not stop and start, because that restarts the adjustment period each time, and do not change the dose yourself. If a symptom is hard to live with, you do not have to wait the full 3 months to ask for advice.
Will HRT affect my periods? Yes, it can, and the answer depends on the type, because some regimens are designed to cause a bleed and others to stop one.
Bleeding that is heavy, lasts beyond 6 months on continuous combined HRT, or starts again after a long break needs checking, usually with an ultrasound scan. Our post on bleeding on HRT explains the patterns in detail. Bleeding that starts after you had gone 12 months without a period, and that does not settle, also needs assessment.
A bleeding diary is the most useful thing to bring. Note the dates, how heavy it was, and whether you missed any doses, because missed doses are a common and fixable reason for breakthrough bleeding.
A first review at about 3 months after starting or changing HRT is standard, and a yearly review follows if all is well. How often should HRT be reviewed beyond that? At least once a year, sooner if something changes. Irregular bleeding should be raised at the first review after 3 months, and severe side effects should be reviewed sooner.
A good review covers:
At each review we check whether the benefit is still clear and the dose is still the lowest that works. Our post on the yearly HRT review explains what that decision involves.
Most HRT side effects are not serious, but some need prompt attention. Get in touch with us if you notice any of these:
Two serious risks are worth knowing in numbers. UK guidance says HRT can slightly increase the risk of breast cancer, with around 5 extra cases in every 1,000 women who take combined HRT for 5 years. Tablets can increase the risk of blood clots, although the risk is still very low, while patches, sprays and gels do not. Your own risk depends on the type of HRT, your age and your history, which is why a personal review matters more than a general number. If you have sudden chest pain, breathlessness or coughing up blood, call 999.
For the full list of effects and when to seek help, see the NHS side effects page.
We start with a clear history: when HRT began, which form and dose you use, what has improved, and what has not. Dr Raquel Delgado reviews blood tests and other investigations as part of women’s health consultations, so the next step depends on what the history shows. That can mean waiting a little longer, adjusting the dose, changing from tablet to patch or gel, or looking for another cause. We also look at the whole picture, not only the side effect that brought you in. Sleep, mood, hot flushes and energy levels show whether HRT is doing its job, and that decides whether a small adjustment is enough or a different approach would suit you better.
Our Consultation Toolkit has short guides on what to bring and which questions to ask. A useful review ends with a plan and a date to check progress. You can read more about our women’s health approach to menopause care.
Breast tenderness, nausea, headaches, bloating, leg cramps, mood changes and spotting are the most common. Most are mild and ease within the first few weeks. If any are severe or last beyond 3 months, a review can adjust the dose, route or type.
For some women the first week or two feels slightly worse as the body adjusts, then eases. A pattern that keeps getting worse, rather than settling, is a reason to review sooner and not wait.
Weight gain is listed among possible HRT side effects, but it may not be caused by HRT, because menopause itself changes weight and fat distribution. Fluid retention early on can also make the scales rise a little. Our menopause weight management support looks at the wider picture.
Irregular spotting in the first few months is common, and it usually settles within 6 months. Bleeding that is heavy, continues beyond 6 months, or returns after a long break needs to be checked. A diary of dates and missed doses makes that check quicker.
Not usually straight away. Mild side effects tend to settle, and we usually advise giving treatment around 3 months where possible. If symptoms are severe, or you are worried, contact us before stopping, because a small change in dose or route often solves the problem.
No. Most ease within weeks. A side effect that lasts beyond 3 months usually points to a dose, route or type that does not suit you, not to something you must put up with. Because HRT can be changed, a review is the right next step.
Often, yes. A change of route (tablet, patch, gel or spray), dose, or type of progestogen can reduce nausea, skin irritation or mood effects. It is the usual next step when a symptom is still there after 3 months.
This article is general information and not a substitute for a personal consultation. If you are worried about HRT side effects, please speak with us.
Dr Raquel Delgado is a private GP in London with more than 20 years of clinical experience in general practice, women’s health, and hormonal care. She has a particular focus on doctor-led, natural-looking aesthetic treatments for women, and consults in both English and Spanish. Every consultation is with Dr Delgado personally, giving you the same clinician’s judgement and continuity of care each time.
We review HRT regularly, and we start by finding what is causing the problem rather than guessing. That can mean adjusting dose or route, checking bleeding patterns, or arranging tests. You can read about our approach at our practice and see the consultation fees in advance. For same-day or next available slots, see our private GP appointments. To arrange a consultation, contact us or reach out using the details below.
If side effects are severe or are not settling, get in touch with us promptly.
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