It is normal and healthy to produce a clear or white discharge from your vagina.
This mucus is produced naturally from the neck of the womb, known as the cervix.
The amount of vaginal discharge varies throughout your menstrual cycle (brown discharge is usually the end of your period) and most pregnant women will get a 'pregnancy discharge'.
Healthy discharge does not have a strong smell or colour. You may feel an uncomfortable wetness, but you should not have any itching or soreness around your vagina.
How do I know if my discharge is unhealthy?
Any sudden change to your discharge may indicate a vaginal infection. You should be aware of how your discharge naturally varies throughout your cycle and what is not normal, but obvious warning signs of infection are:
- a change in colour or consistency
- a sudden bad smell
- an unusually large amount of discharge
- another symptom alongside the discharge, such as itching outside your vagina or pain in your pelvis or tummy
- unexpected bleeding from the vagina
If you are not sure whether your discharge is normal and are worried about it, see your doctor or nurse.
Vaginal discharge causes
There are many possible causes of abnormal vaginal discharge, but it is usually a sign of infection. The infection is often caused by something that upsets the natural balance of bacteria or yeast in your vagina, such as washing inside the vagina, or it may be sexually transmitted.
The most common causes are:
- thrush - a fungal infection that commonly affects the vagina
- bacterial vaginosis - a bacterial infection of the vagina
- trichomoniasis - a sexually transmitted infection (STI) caused by a tiny parasite
- gonorrhoea or chlamydia - STIs caused by bacteria
- genital herpes - an STI caused by the herpes simplex virus
The guide below may help you identify the cause of your discharge. However, it is important to see your doctor for a proper diagnosis and for advice on how to treat the infection.
Watery or white vaginal discharge with intense itchiness
If your discharge is thin and watery or thick and white (like cottage cheese), you may have thrush. This common fungal infection causes intense itchiness and soreness around your vagina. The discharge may smell slightly yeasty, but does not have a strong smell.
Almost all women get thrush from time to time and it is not sexually transmitted. It is easily treated with antifungal medicine, which can be bought over the counter from your pharmacist.
White or grey fishy-smelling discharge
If your vaginal discharge is grey or develops a strong fishy smell, particularly after sexual intercourse, you could have bacterial vaginosis (BV). BV is an imbalance in the normal bacteria found in your vagina. It does not usually cause itching or irritation.
Like thrush, BV is very common and is not sexually transmitted. It is easily treated with antibiotics. See your doctor for a prescription.
Green, yellow or frothy discharge
Trichomoniasis is a common STI caused by a tiny parasite. It can make your vaginal discharge frothy, yellow or green. You may have a lot of discharge, which may also have an unpleasant fishy smell. Other possible symptoms are soreness, swelling and itching around the vagina, and pain when passing urine.
Trichomoniasis is easily treated with an antibiotic called metronidazole, which your doctor will prescribe. If you have trichomoniasis you should visit a local GUM or sexual health clinic as it can exist alongside other STIs.
Abnormal discharge with pain or bleeding
If your vaginal discharge is abnormal and you have pain in your pelvis or when you urinate, or you bleed between periods or after sex, you may have chlamydia or gonorrhoea (both STIs). Gonorrhoea can make your discharge turn green, although often the pain or bleeding are more noticeable.
If you have any of these symptoms, see your doctor or go to a genitourinary medicine (GUM) clinic as soon as possible for treatment with antibiotics. Untreated gonorrhoea or chlamydia may spread upwards and lead to pelvic inflammatory disease, a serious infection of the womb, fallopian tubes or ovaries.
Abnormal discharge with blisters around the genitals
Genital herpes can cause painful, red blisters or sores to appear around your genitals, as well as an abnormal vaginal discharge. See your doctor or go to a genitourinary medicine (GUM) clinic as soon as possible. You may be offered a course of antiviral tablets, which will stop the herpes virus multiplying, but the symptoms may have a tendency to return.
Young girls and post-menopausal women
It is unusual for young girls to have abnormal vaginal discharge before they have gone through puberty. If this happens, they should see a doctor. There may be a lost object inside their vagina, such as a tampon.
Abnormal discharge is also unusual in older women. If you have gone through the menopause and suddenly notice an abnormal vaginal discharge, see your doctor as soon as possible to rule out cervical cancer or endometrial cancer.