Cystitis means inflammation of the bladder. It is usually caused by a urine infection. Some women have recurring bouts of cystitis, defined as two proven infections within six months, or three infections in a year. In many cases there is no apparent cause. Treatment options to consider include treating each episode promptly with a short course of antibiotics; a regular dose of antibiotics taken long-term; a daily dose of cranberry juice; taking a single dose of antibiotic after having sex (if having sex seems to trigger episodes of cystitis).
What is cystitis?
Cystitis means inflammation of the bladder. It is usually caused by a urine infection. Typical symptoms are pain when you pass urine, and passing urine frequently. You may also have pain in your lower tummy (abdomen), blood in your urine and high temperature (fever). Your urine may also become cloudy or smell offensive.
About half of all women have at least one bout of cystitis. For many, only one or two bouts occur in their lifetime. However, repeated (recurring) bouts of cystitis occur in some women. This most commonly occurs in women in their late 20s and in women aged over 55.
This leaflet is for women who are prone to recurring cystitis. Cystitis is said to be recurrent when a woman has had two proven infections within six months, or three infections in a year.
Understanding the bladder and genital area
Most urine infections are caused by germs (bacteria) that come from your own bowel. They cause no harm in your bowel but can cause infection if they get into other parts of your body. Some bacteria thrive in urine and multiply quickly to cause infection.
Some bacteria lie around your back passage (anus) after you pass a stool (faeces). These bacteria can sometimes travel to your urethra and into your bladder. Some bacteria thrive in urine and multiply quickly to cause cystitis.
Women are more prone than men to cystitis, as their urethra (the tube from the bladder that passes out urine) is shorter and opens nearer the anus.
Why do some women have recurring cystitis?
Your body has defences to prevent germs (bacteria) from causing cystitis. The mucus around your vagina and opening of your urethra is slightly acid which prevents bacteria from multiplying. Although bacteria may thrive in urine, you empty your bladder regularly which flushes urine out. Also, the cells that line your urethra and bladder have some resistance against bacteria.
In most cases, there is no apparent reason why cystitis returns (recurs). There is usually no problem with your bladder or defence (immune) system that can be identified. It is possible there may be a slight alteration in the ability of the body to resist bacteria getting into the bladder and causing infection. A slight variation in the body's defence may tip the balance in favour of bacteria to cause infection. (In a similar way, some people seem more prone to colds, sore throats, etc.)
For some women, one of the following may contribute:
- Bladder or kidney problems may lead to infections being more likely. For example, kidney stones, or conditions that cause urine to pool and not drain properly. Your doctor may arrange some tests if a problem is suspected.
- Having sex increases the chance of cystitis in some women (see below).
- Hormones. Your vagina, bladder and urethra respond to the chemical (hormone) called oestrogen. When the levels of oestrogen in the body reduce, the tissues of these organs become thinner, weaker, and dry. These changes can increase the risk of recurrent cystitis if you have gone through the change (menopause). Cystitis is also more common during pregnancy because of changes in the urinary tract.
What can I do to help prevent cystitis?
If you only have the occasional bout of cystitis, you do not need to do anything or change your lifestyle. If you have repeated (recurring) cystitis, one or more of the following may help:
- Hygiene. There is no evidence that poor hygiene can lead to cystitis. In fact, some women wash their back passage (anus) and vagina too much, which may do more harm than good. Too much scrubbing and cleaning may slightly damage your genital skin. Germs (bacteria) thrive better on damaged skin. Cleaning or douching your vagina may alter the normal balance of protective mucus, which may allow bacteria to thrive. A common sense approach is to wash your anus and the nearby skin gently once a day with soap and water. Do not scrub and do not douche your vagina.
- Wiping your anus from front to back after you pass a stool (faeces) is commonly advised. The logic is that bacteria from your anus will be pushed back away from your urethra, and not towards it.
- Drink lots each day to flush out your bladder frequently. This may possibly help to prevent cystitis. (There is no proof, but it seems sensible.) It is also commonly advised to drink lots to treat cystitis if symptoms start. However, the advice to drink lots after symptoms start is controversial. This may do little to clear bacteria from an inflamed bladder, and drinking lots may just cause more (painful) toilet trips.
- Underwear. Wear cotton underwear and change daily. Do not wear tight-fitting trousers or tights. This avoids warm, moist, airless conditions around your genitals, which some types of bacteria like. Again, there is no proof that this advice helps, but it seems sensible.
What are the treatment options for recurring cystitis?
Prompt self-treatment of each bout of cystitis
Antibiotic medication is usually needed for the treatment of bouts of recurrent cystitis. If your symptoms are mild then it is usually advisable to wait for the results of your urine test to see which antibiotics you should be treated with. However, if your symptoms are bad or worsening then you should start antibiotics without any delay.
Some women are prescribed a supply of antibiotics to keep on standby. You can then treat a bout of cystitis as soon as symptoms begin without having to wait to see a doctor. A three-day course of antibiotics is the usual treatment for each bout of cystitis.
Ideally, you should do a midstream specimen of urine (MSU) to send to the laboratory before starting a course of antibiotics. You should see a doctor if your symptoms do not go within a few days, or if they worsen.
Antibiotic prevention is another option
This means taking a low dose of an antibiotic regularly. One dose each night will usually reduce the number of bouts of cystitis. A six-month course of antibiotics is usually given.
You may still have bouts of cystitis if you take antibiotics regularly (but they should be much less often). If a bout does occur, it is usually caused by a germ (bacterium) that is resistant to the antibiotic you are taking regularly. A urine sample is needed to check on which bacterium is causing any bout of cystitis. You may then need a temporary change to a different antibiotic.
Cystitis related to having sex
Some women find that they are prone to cystitis within a day or so after having sex. This may be partly due to the movements during sex which may push bacteria up into the bladder. There may also be slight damage to the urethra, which encourages bacteria to thrive. This is more likely if the vagina is dry during sex. The normal mucus in and around the vagina may also be upset if spermicides or diaphragm contraceptives are used. The following may reduce the chance of cystitis developing after sex:
- After having sex, go to the toilet to empty your bladder.
- If your vagina is dry, use a lubricating jelly during sex.
- One option is to take a single dose of antibiotic within two hours after having sex.
- Do not use spermicides and/or a diaphragm for contraception. See your doctor or practice nurse for advice on other forms of contraception.
There is conflicting evidence about cranberry products preventing cystitis. Cranberry is not an antibiotic and does not kill bacteria. A chemical in the cranberry product is thought to prevent certain bacteria from attaching to cells that line the bladder. The theory is that this helps to prevent bacteria from infecting the bladder. Therefore, cranberry may help to prevent (rather than cure) cystitis.
A research trial was published in 2011. In this trial, 319 students who had had a urine infection were followed up for six months, or until they had a second urine infection (whichever came first). They were split into two groups - those who took a glass of cranberry juice each day and those who did not. The results showed that the number of women who had a second urine infection within six months was no different in the two groups.
What seems clear is that cranberry juice is no magic cure and will not prevent all bouts of cystitis. But, it may help to reduce the number of cystitis bouts, and it may be worth a try. If you do give it a try, some points about cranberry products include:
- You can buy cranberry extracts (capsules, drinks, etc) from supermarkets, pharmacies and health stores. They are not available on the NHS.
- The optimum dose is not yet clear. It is thought that a daily dose of a high-strength capsule (containing at least 200 mg of cranberry extract) is best, as this is likely to be more effective than drinking cranberry juice. This may be why the more recent trial (using juice) did not show any benefit.
- Cranberry can react with certain medicines. In particular, do not take it if you take a medicine called warfarin.
Dr Tim Kenny
Dr Hayley Willacy
Dr Colin Tidy