Genital herpes: symptoms, testing and treatment
Genital herpes is common, frequently silent and rarely dangerous, but the first episode can be genuinely painful and the diagnosis lands hard. This page explains what the symptoms look like, how the infection is actually confirmed, what antiviral treatment does and does not achieve, what it means for partners and for pregnancy, and which signs mean you should be seen urgently rather than waiting for an appointment.
What are the symptoms?
A first episode usually begins with tingling, itching or soreness, followed by small blisters that break down into shallow, painful ulcers on the vulva, penis, scrotum, buttocks, thighs or around the anus. Passing urine over raw skin can be very painful, and the glands in the groin are often swollen and tender. Many people feel flu-like in the first days: aches, headache, mild fever.
Recurrences are typically milder and shorter than the first episode. They often start with warning sensations in the same area, produce fewer lesions and settle faster, and they usually become less frequent over the years.
A large proportion of people with the virus never recognise an episode at all, or put occasional soreness down to friction, thrush or a cut from shaving. That is one reason the infection is so widespread: most transmission comes from people who do not know they have it.
How is genital herpes confirmed?
The reliable test is a swab taken directly from a fresh blister or ulcer and analysed for viral genetic material. That means testing is most accurate early in an episode, while lesions are still present, so it is worth being seen while symptoms are active rather than waiting until they have healed.
Blood tests that look for antibodies have a limited role. They cannot tell you where the infection is on the body or when you acquired it, and they are not part of routine screening. Home postal kits for sexually transmitted infections typically cover chlamydia, gonorrhoea, HIV and syphilis, and they do not diagnose herpes, because that requires a swab of a lesion.
In Ireland, testing and treatment are available through public sexual health services and through a GP. Because the symptoms overlap with other conditions, a full sexual health check is usually offered at the same time; other infections are common and frequently silent.
What does treatment achieve?
Oral antiviral medicines such as aciclovir and valaciclovir are prescription-only. Taken early in an episode, they reduce the severity and shorten the time to healing. They do not clear the virus from the body, and starting them once the lesions are already healing adds little.
For people with frequent recurrences, a doctor can prescribe a continuous daily antiviral, known as suppressive treatment. This substantially reduces how often episodes occur and also lowers the risk of passing the virus to a partner, although it does not remove that risk. Suppressive treatment is usually reviewed periodically to see whether it is still needed.
Simple measures make the first episode more bearable: paracetamol or ibuprofen, salt baths, passing urine in a warm bath or pouring water over the area while going, loose cotton underwear, and keeping the skin clean and dry. Local anaesthetic preparations are sometimes recommended by a clinician; ask before using anything on broken skin.
What does it mean for partners?
The virus is passed by skin-to-skin contact with an affected area, and it can be passed on even when there are no visible lesions, through what is called asymptomatic shedding. Condoms reduce the risk substantially but do not eliminate it, because they do not cover all the skin involved.
Avoid sex from the first warning sensation until the skin has fully healed. Between episodes, the combination of consistent condom use and, where appropriate, suppressive antiviral treatment reduces transmission considerably. Telling a partner is a personal decision, but it allows them to make an informed one and to recognise symptoms if they appear.
A new diagnosis in a long-standing relationship does not prove recent infidelity. The virus can lie dormant for years before a first noticeable episode, so the timing of symptoms says very little about when it was acquired. This is worth knowing before the conversation, not after it.
When do I need medical help without delay?
Seek help urgently, the same day, if you cannot pass urine at all, or if pain and swelling make it impossible to go. Retention of urine is a recognised complication of a severe first episode and needs treatment rather than endurance.
Call 112 or 999 or go to an Emergency Department if you develop a severe headache with neck stiffness, dislike of bright light, confusion, a seizure, or weakness or numbness in the legs or around the buttocks alongside genital symptoms. These are rare complications, but they are emergencies. The same applies if you become very unwell with a high fever and rapidly spreading redness and pain.
Arrange assessment promptly, not eventually, if you are pregnant and have any genital herpes symptoms or a new diagnosis, if your immune system is suppressed by medicines or illness, if ulcers are not healing after two to three weeks, or if recurrences are frequent and severe. Painful genital ulcers should always be looked at rather than self-diagnosed.
Genital herpes and pregnancy
Tell your midwife or maternity team if you have genital herpes or develop symptoms during pregnancy, even if the diagnosis was made years ago. Most women with a long-standing infection have a normal pregnancy and delivery, because antibodies developed before pregnancy pass to the baby and provide protection.
The situation that needs specialist attention is a first episode acquired late in pregnancy, particularly in the last weeks, when there has not been time to develop those antibodies. In that case the maternity team will discuss antiviral treatment and the safest mode of delivery. These are decisions taken in a maternity service, not questions to settle online.
Herpes infection in a newborn is rare and serious, which is why the precautions matter. After delivery, anyone with an active cold sore should avoid kissing the baby and should wash their hands before handling them.
Living with recurrent herpes
Recurrences generally become less frequent and less severe over time. Many people find that flares follow identifiable circumstances: another illness, stress, poor sleep, friction, or a period. Noting what preceded a flare over a few months often reveals a pattern that can be worked around.
Practical measures help: loose clothing and cotton underwear, avoiding perfumed products on the area, using lubricant during sex to reduce friction, and treating any other skin condition that breaks the skin. Shaving or waxing the area during a flare tends to prolong it.
The psychological effect of the diagnosis is often heavier than the physical one, and that deserves as much attention. Accurate information usually helps more than reassurance: this is a common infection, it does not affect fertility, it does not cause cancer, and it is manageable. Sexual health services in Ireland can provide counselling alongside treatment, and it is reasonable to ask for it.
Can genital herpes be cured?
No treatment removes the virus from the body. Antiviral medicines shorten episodes and, taken continuously as suppressive treatment, greatly reduce how often they occur and lower the risk of passing the virus on. Most people find episodes become less frequent over the years regardless.
Can I pass it on when I have no symptoms?
Yes. The virus can be shed from the skin without any visible lesion, which is how most transmission happens. Condoms reduce the risk but do not remove it, and suppressive antiviral treatment prescribed by a doctor lowers it further.
Does a home STI test kit detect herpes?
Generally no. Postal kits usually cover chlamydia, gonorrhoea, HIV and syphilis. Herpes is confirmed by swabbing an active blister or ulcer, so you need to be seen while symptoms are present.
Does genital herpes affect fertility or cause cancer?
No. Genital herpes does not reduce fertility and is not a cause of cervical cancer, which is linked to human papillomavirus, a different virus. The main medical concerns are painful episodes, transmission to partners and the specific situation of a first episode late in pregnancy.
My partner has just been diagnosed. Does that mean they were unfaithful?
Not necessarily. The virus can remain dormant for years before causing a recognisable episode, and many people acquire it without ever noticing symptoms, so the timing of a first episode says very little about when the infection was acquired.