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Premenstrual syndrome (PMS) is the name given to the physical, psychological and behavioural symptoms that can occur in the two weeks before a woman's monthly period. It is also known as premenstrual tension (PMT).
These symptoms usually improve when the period starts, and they disappear a few days afterwards.
Nearly all women of child-bearing age have some premenstrual symptoms, but women aged between their late 20s and early 40s are most likely to experience PMS.
Premenstrual dysphoric disorder (PMDD)
A small number of women find that their symptoms are severe enough to stop them living their normal lives. This is due to a more intense type of PMS known as premenstrual dysphoric disorder (PMDD).
If you are finding it difficult to deal with the symptoms of PMS, see your GP. They can help to determine if you have PMDD, and may be able to offer you treatment to manage the symptoms you're experiencing.
Read more about how PMS is diagnosed.
Why it happens
The exact cause of PMS is not fully understood. However, it is thought to be linked to the changing levels of hormones in the body during a woman's menstrual cycle.
Certain lifestyle factors such as lack of exercise, stress and eating a poor diet are also thought to aggravate the symptoms of PMS.
Read more information about the causes of PMS.
Managing PMS symptoms
There is no cure for PMS, but the symptoms can often be managed with treatment. This may include medication, hormone or psychological treatments.
Certain lifestyle changes can also help to manage symptoms. These includes:
PMS usually improves after the menopause
There are many different symptoms of premenstrual syndrome (PMS), which can vary from person to person and change slightly every month.
For example, you may find that you have similar PMS symptoms every month but they vary in intensity. Or you may have slightly different symptoms every few months. PMS tends to be different for every woman.
The symptoms of PMS usually happen at the same time in your menstrual cycle each month, which can be up to two weeks before your period starts. They usually improve once your period has started, and then disappear until your cycle starts again.
More than 100 different symptoms of PMS have been recorded, but the most common are listed below.
Physical PMS symptoms
Psychological PMS symptoms
Behavioural PMS symptoms
Premenstrual dysphoric disorder
While most women with PMS find their symptoms uncomfortable, a small percentage have symptoms that are severe enough to stop them living their normal lives. This is due to a more intense type of PMS, known as premenstrual dysphoric disorder (PMDD).
The symptoms of PMDD are similar to those of PMS, but more exaggerated and often have more psychological symptoms than physical ones. They can include:
As depression is a common symptom of PMDD, it is possible that a woman with PMDD may have thoughts about suicide.
PMDD can be particularly difficult to deal with because it can have a negative effect on your daily life and relationships. See your GP if you are experiencing severe symptoms.
Read more about treating PMS and PMDD.^^ Back to top
The exact cause of premenstrual syndrome (PMS) is not fully understood, but various possible factors may contribute to the symptoms.
These are described below.
During your menstrual cycle, levels of hormones such as oestrogen and progesterone rise and fall. Hormone changes are thought to be the biggest contributing factor to many of the symptoms of PMS. The fact that PMS improves during pregnancy and after the menopause, when hormone levels are stable, supports this theory.
Like your hormone levels, certain chemicals in your brain, such as serotonin, fluctuate during your menstrual cycle. Serotonin is known to help regulate your mood and make you feel happier, so it is possible that women with low levels of serotonin are particularly sensitive to the symptoms of PMS. Low levels of serotonin may also contribute to symptoms such as:
Weight and exercise
Research has shown that you are more likely to have PMS if you are obese (with a body mass index of more than 30) and if you do little exercise.
You may find that your symptoms of PMS get worse as you become more stressed. While it is not a direct cause, stress can aggravate the symptoms of PMS.
Read more about how to manage stress.
Eating too much of some foods and too little of others may also contribute to PMS symptoms. For example, too much salty food may add to fluid retention and make you feel bloated. Alcohol and caffeinated drinks can disrupt your mood and energy levels. Low levels of vitamins and minerals may also make your PMS symptoms worse.
Read more about maintaining a balanced diet.^^ Back to top
There is no test or procedure that can diagnose premenstrual syndrome (PMS), but if you are finding your symptoms difficult to deal with, see your GP.
In order to identify exactly what symptoms you have and how severe they are, your GP may ask you to use a diary or chart to record how you're feeling each day in the run-up to your period. You may have to do this for at least two months so that your GP can monitor any possible symptom patterns.
Premenstrual dysphoric disorder
If you think you may have premenstrual dysphoric disorder (PMDD), see your GP.
To determine whether you have PMDD, and to rule out other conditions, your GP may:
They may also be able to suggest specific treatments to relieve your symptoms.
PMDD is only diagnosed when your mood symptoms seriously affect your relationships and stop you from functioning properly at work or school.
Read more about treating PMS and PMDD.^^ Back to top
There is no cure for premenstrual syndrome (PMS) but there are treatments that can help you manage your symptoms so they do not interfere with your daily life.
However, if your PMS is mild or moderate, you may want to make changes to your diet and lifestyle before resorting to medical treatment. This is because many of the medical treatments can have side effects that may be worse than your PMS symptoms.
The following tips can help you to maintain a healthy, balanced daily diet:
Read more information about healthy eating.
If possible, aim to do at least 150 minutes (2 hours and 30 minutes) of moderate-intensity aerobic activity every week. Examples of activities include walking, swimming and cycling. Exercise improves your overall health and can help to alleviate depression and tiredness.
Stretching and breathing exercises, such as yoga and pilates, can help you sleep better and reduce your stress levels.
There are many non-prescribed alternative treatments and supplements for PMS, and many women find them helpful in easing their symptoms. However, there is little research to back up their effectiveness. Most of the existing studies have shown mixed results.
Examples of complementary therapies that may reduce some symptoms of PMT are vitamins and minerals such as magnesium, vitamin B6 and vitamin E.
Always see your GP before taking any complementary medicine or supplement. If you decide to take a complementary treatment, take one at a time so you know if it works for you. If your symptoms don't change after three months, go back to your GP, who may recommend another treatment.
If you have psychological symptoms, such as feeling depressed or emotional, it may help to talk to a health professional. Cognitive behavioural therapy (CBT) is the term for a group of therapies that are designed to help solve problems such as anxiety and depression. A cognitive behavioural therapist can help you learn new ways of managing some of your symptoms.
Read more about cognitive behavioural therapy.
If your PMS is severe or you have premenstrual dysphoric disorder (PMDD), you may wish to try a medical treatment. However, there is no single treatment that works for everyone.
A wide range of treatments are available. You may have to try several before you find one that suits you. Your choice of treatment will be based on your symptoms and how severe they are, and the possible side effects of the medication.
If your GP prescribes you a treatment for PMS, they may ask you to record any changes to your symptoms so that you both know how effective it is for you. If the treatment doesn't ease your symptoms, your GP may prescribe an alternative.
Medical treatments for PMS include:
These are described in more detail below.
Non-steroidal anti-inflammatory drugs (NSAIDs)
You can take NSAIDs, such as ibuprofen and aspirin, to ease stomach cramps and sore breasts. They may also relieve headaches, muscle pain and joint pain, but they can make fluid retention worse.
Children under the age of 16 shouldn't take aspirin. If you have asthma, do not take ibuprofen.
As well as preventing pregnancy, some types of contraception can be prescribed to regulate symptoms of PMS. They often work by stopping ovulation (when an egg is released from your ovaries) or stabilising hormone levels, which can help to control mood swings. These include:
However, not all these forms of contraception work for all women with PMS, and they can have side effects. The side effects can be similar to the symptoms of PMS and may include, for example, fluid retention and irritability.
Selective serotonin reuptake inhibitors (SSRIs)
Selective serotonin reuptake inhibitors (SSRIs) may be the most effective treatment if you have severe PMS or PMDD. SSRIs, such as fluoxetine and sertraline, are antidepressants that can be taken daily to relieve tiredness, food cravings, sleep problems and combating depression.
Gonadotrophin-releasing hormone analogues
Gonadotrophin-releasing hormone (GnRH) analogues are synthetic hormones that create a temporary menopause and stop your periods by blocking the production of oestrogen and progesterone. They are taken as an injection and work in a similar way to gonadotrophin-releasing hormone (which is a natural female hormone).
GnRH analogues should only be used in women with severe PMS when all other treatments have failed. They often have side effects, such as hot flushes, vaginal dryness and loss of libido.
Drug names include goserelin, nafarelin and leuprorelin.
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