Almost everything that matters about a tick bite happens in the first few minutes, and almost everything people worry about is decided by whether they got that part right. The rest of this chapter exists because the follow-up advice in Britain differs from the advice you will read online, and because there is now a second infection to know about.
1. Removal — the whole intervention
How, exactly
- Do not wait to see anyone. This is the first instruction and it overrides the rest — delaying removal to get to a GP or a pharmacy increases the risk, because transmission depends on how long the tick stays attached. Remove it where you are.
- Fine-tipped tweezers or a tick-removal tool are best. But if you do not have either, ordinary tweezers or your fingers are better than waiting — grip close to the skin and avoid squeezing the body. An earlier version of this page said not to use fingers; that was stricter than the guidance and would cause exactly the delay the guidance is trying to prevent.
- Grip as close to the skin as you can — you are aiming for the mouthparts, not the body. Squeezing a full body is what pushes gut contents into the wound.
- Pull straight up, steady and even. No jerking, no twisting, no rocking. A tick-removal tool twists by design; tweezers do not.
- Then wash with soap and water, and clean the site with antiseptic if you have it.
- If mouthparts stay behind, leave them. They are not infectious and will work out as the skin heals. You can lift them with tweezers if they come easily — if they do not, leave them alone. Digging causes more damage than they do.
- If you found one, look for others. Ticks arrive in numbers from the same patch of vegetation, so a single find is a reason to check the whole body now rather than tonight.
- Disposing of it: a sealed container, tightly wrapped tape, alcohol, or down the toilet. Do not crush it between your fingers.
Two practical points. Write the date down, and where on the body — if something develops six weeks later, that note is the most useful piece of clinical information anyone will have.
Do not have the tick tested, and there are four separate reasons
- The laboratories offering it are not held to clinical diagnostic standards. Commercial tick testing sits outside the quality control that applies to a test on a person, and its results should not drive treatment.
- A positive tick does not mean an infected person. Most bites from an infected tick still do not transmit anything, particularly if it was removed promptly.
- A negative result is falsely reassuring — and this is the one people miss. You may have been bitten by another tick you never found, and nymphs are the size of a poppy seed.
- The results arrive too late to matter. If you are going to develop symptoms, you will almost certainly develop them before a tick test comes back — and you should not be waiting on it before starting treatment.
So keep the date, not the tick. Identifying the species does not change UK management either, because Ixodes ricinus does nearly all the biting here.
2. What is actually in British ticks
One species does nearly all the biting: Ixodes ricinus, the sheep tick, which is widespread across the UK and found in woodland, moorland, heath, rough grassland and a good many urban parks. Peak activity runs roughly April to October, with a spring and an autumn rise, though mild winters have blurred that.
| Infection | How common in the UK |
|---|---|
| Lyme borreliosis | The one that matters. 1,168 laboratory-confirmed cases in England in the most recent reporting year — up from 959 the year before and similar to 1,151 in 2023. True numbers are higher, because cases diagnosed clinically from a rash are treated without testing and never counted |
| Tick-borne encephalitis | New here, and the reason this chapter exists. Six UK-acquired cases in total, the first in 2019. Section 5 |
| Louping ill virus | Long endemic in British sheep and grouse, very rarely infects humans — but it cross-reacts with TBE on antibody tests, which complicates diagnosis rather than causing much disease |
| Anaplasmosis, babesiosis, rickettsial infections | Documented in the UK but genuinely rare. Worth a clinician's thought in someone unwell after a bite with abnormal blood counts, not worth a well person's worry |
| Alpha-gal syndrome | Red meat allergy triggered by tick bites — overwhelmingly a US phenomenon linked to a different tick. Isolated European reports exist; not a UK concern in practice |
3. Erythema migrans — and what it does not look like
The rash of early Lyme disease is the single most useful sign in this whole subject, because it is diagnostic on its own — no blood test required, and treatment starts on sight.
- Timing: 3 to 30 days after the bite, most often around a week to two weeks. A red mark appearing within hours is a local reaction to the bite, not this.
- It expands. That is the defining feature — it grows over days, typically to more than 5 cm across and often much larger.
- It is usually not a bullseye. The classic target with central clearing is a minority presentation in Europe; most are uniformly red or pink. Waiting for a bullseye is the commonest reason a diagnosis is missed.
- It is usually not painful, hot or itchy, which is what separates it from cellulitis and from an ordinary bite reaction.
- It does not have to be where the tick was, and multiple lesions can occur.
- And a bite is not required. Many people with Lyme disease never saw a tick, because nymphs are the size of a poppy seed.
What else Lyme disease can do, if the rash is missed. Weeks to months later: facial nerve palsy (particularly in children, and particularly if bilateral), nerve root pain, meningitis, a large-joint arthritis usually of the knee, and rarely heart block. Persistent unexplained fatigue, headache and joint pain within weeks of a bite deserve the same conversation. Any of these after a possible tick exposure should be mentioned as such — the bite history is what turns a puzzling presentation into an obvious one.
4. Treatment, and where the UK differs from what you will read online
The American guidance differs, and this is why people ask. The IDSA recommends a single 200 mg dose of doxycycline within 72 hours — but only for a bite that meets all of its high-risk criteria: an Ixodes tick, in a highly endemic area, attached for 36 hours or more. Without all three, it says monitoring is as effective as treating. Most UK bites do not meet that bar, background infection rates here are lower, and the judgement is that treating everyone would deliver more antibiotic harm than benefit. That is a defensible difference of degree rather than a disagreement about the science.
| Presentation | UK first line (NICE NG95) |
|---|---|
| Erythema migrans, adults and young people 12+ | Doxycycline 100 mg twice daily for 21 days. Started on the rash alone — do not wait for a blood test, which may still be negative |
| If doxycycline unsuitable, or in pregnancy | Amoxicillin 1 g three times daily for 21 days. Doxycycline is avoided in pregnancy and breastfeeding |
| Affecting the central nervous system | Doxycycline 200 mg twice daily, or intravenous ceftriaxone — the higher oral dose reaches spinal fluid concentrations faster. 21 days |
| Meningitis or encephalitis before the diagnosis is known | Intravenous ceftriaxone, and this is a hospital presentation |
| Children | Discuss with a specialist — every case under 18, with one exception: a single erythema migrans lesion and no other symptoms, which can be treated without referral. There is no age band in that rule. The 9-to-12 split people quote is the dosing boundary — weight-based doxycycline, off-label, with amoxicillin by weight below it — and not the referral rule. Conflating the two sends children with a single rash to a specialist unnecessarily, and keeps children with other symptoms out of one |
| Cardiac involvement | Not azithromycin, because of its effect on the QT interval |
- 21 days is the UK course, and the US uses 10. Both are defensible readings of thin evidence; the point of mentioning it is that a reader comparing sources will find the difference and should not conclude either is wrong.
- Warn people about the Jarisch–Herxheimer reaction — fever, chills and feeling worse in the first day or two of treatment, as the organisms are killed. It is a sign the antibiotic is working, not an allergy, and people stop treatment over it.
- Doxycycline causes photosensitivity. Twenty-one days in summer, when tick bites happen, means real sunburn risk — see the sunscreen chapter.
- Finish the course even if the rash goes in the first week, which it often does.
Testing, and when it misleads
With a typical erythema migrans, do not test — treat. Antibody tests are frequently negative in the first few weeks, because they measure your immune response rather than the organism, and a negative result at that stage has caused a great many missed diagnoses.
Without a rash but with suggestive symptoms: an ELISA first; if positive, an immunoblot to confirm; and if negative but symptoms persist, repeat in 4 to 6 weeks rather than treating the first result as an answer. Testing an asymptomatic person after a bite is not useful and should not be requested.
5. Tick-borne encephalitis — the new one
Two different maps get conflated here, and they are not the same thing. UKHSA has found the virus in ticks in Thetford Forest, on the Hampshire–Dorset border, and in parts of the North Yorkshire Moors. The places where people have acquired it are a wider and partly different list, including Dartmoor, Loch Earn and the Peak District. A site that merges the two produces a map that is wrong in both directions — it implies surveillance has confirmed virus where it has only recorded a case, and it understates where cases have occurred. Position per GOV.UK guidance updated 17 August 2026; this will change again.
What to know, without alarm
- The risk is very low, and should be read against 1,168 Lyme cases in the same period. Six cases in seven years is not a reason to avoid woodland.
- Most infections cause little or nothing. The European subtype carried by our sheep tick is the mildest of the three, and only about two or three in ten of those who develop symptoms get central nervous system involvement.
- The pattern is biphasic, and that is the clue. Flu-like illness — fever, headache, muscle ache — then a few days of feeling better, then in a minority a second phase with neurological symptoms: confusion, unsteadiness, severe headache. The gap is what distinguishes it, and it is the part a patient can report and a clinician can act on.
- There is no antiviral treatment — care is supportive. So unlike Lyme, early recognition changes monitoring rather than cure.
- A vaccine exists, and the UK recommendation is broader than occupational exposure. The Green Book (chapter 31) recommends it for travel to endemic areas where there will be exposure risk — walking, camping, forestry work in central and eastern Europe or Scandinavia — as well as for defined occupational risk. What it is not recommended for is UK exposure: the domestic case count does not come close to justifying it. An earlier version of this page said occupational only, which understated who should be asking about it before a trip.
- Antibiotics do nothing for it, which matters because the early symptoms overlap with Lyme disease and a course of doxycycline can look falsely reassuring.
6. Prevention, in order of how much it achieves
Check yourself, and check children, the same day
This is the highest-value action on the page, because transmission rises with attachment time and a tick found the same evening has usually transmitted nothing. Look at the warm folded places: behind knees, groin, armpits, waistband, navel, and in children the hairline, neck and behind the ears. Nymphs are poppy-seed sized — you are looking for a new freckle that was not there this morning.
Cover skin, and tuck
Long sleeves, trousers tucked into socks, and light colours so you can see them. Ticks climb up from vegetation rather than dropping from trees, so ankles and lower legs are where they arrive.
Stay on the path
Ticks sit on vegetation at the edges. Brushing through long grass and bracken is the exposure; walking the middle of a path is not.
Use a repellent that works
DEET on skin at 20–50%, or 0.5% permethrin on clothing, which is more effective than anything applied to skin and survives several washes. Citronella and similar do not work for ticks.
Shower and put clothes through a hot dryer
Showering within a couple of hours helps find unattached ticks. A tumble dryer on high kills ticks in clothing; washing alone often does not.
Treat the dog
Dogs bring ticks indoors and get their own tick-borne disease. Regular veterinary tick prevention protects the household as well as the animal.
7. Bitten abroad — what changes
Almost everything above is about Ixodes ricinus, because that is what bites people in Britain. Travel changes the list, and it changes it most in the United States, where a second tick causes a set of illnesses that do not occur here.
| Where | What is different |
|---|---|
| United States — the lone star tick, Amblyomma americanum | Absent from the UK, and responsible for several things Ixodes is not. Ehrlichiosis: fever, chills, headache, aches and nausea about 5 to 14 days after a bite, with a rash in up to 60% of infected children. Tularemia: fever with swollen glands near the bite, sometimes an ulcer at the site. And rarely Bourbon and Heartland viruses, which look like ehrlichiosis |
| STARI — and this is the trap | A lone star bite can produce an expanding circular rash that looks like erythema migrans and is not Lyme disease. Southern tick-associated rash illness, sometimes with fever, headache and joint pain. It is why a bullseye rash acquired in the American south is not automatically a Lyme diagnosis — though in areas where the two overlap, treating empirically is what is recommended |
| Rocky Mountain spotted fever | A different tick again, potentially severe, and treated urgently on clinical suspicion rather than waiting for confirmation. Fever with headache and a rash that often starts on wrists and ankles. Prophylaxis after a bite is not recommended for it — the point is early treatment if you become unwell |
| Alpha-gal syndrome | Not an infection: a lone star bite can induce allergy to red meat, and sometimes to dairy and gelatin, with reactions typically delayed some hours after eating. Overwhelmingly American; isolated European reports exist |
| Central, eastern and northern Europe, and parts of Asia | Tick-borne encephalitis is properly endemic in a belt running from eastern France through Austria, Germany, Switzerland, the Baltics, Poland, the Czech Republic, Slovenia, Scandinavia and into Russia. The vaccine is worth considering for anyone walking, camping or working outdoors there, and it is a travel-clinic conversation rather than an afterthought — UK exposure is a handful of cases in seven years, while these are areas with hundreds a year |
The clinical point for a UK reader, and for whoever sees them. If you become unwell after a tick bite abroad, say where you were bitten before you say what your symptoms are — because the geography changes the differential completely, and a rash acquired in Arkansas needs a different set of thoughts from one acquired in the New Forest. It is also the reason a returning traveller with unexplained fever should mention outdoor activity even without a remembered bite.
8. Persistent symptoms after treated Lyme disease
Some people remain unwell after a properly treated infection — fatigue, pain, poor concentration, sometimes for many months. This is real, it is recognised, and it is disabling. It has a name, post-treatment Lyme disease syndrome, and it deserves to be taken as seriously as the acute illness.
What the evidence supports, and what it does not
- One further standard course is allowed, and that is not the thing the trials rejected. NG95 permits a second course with a different antibiotic if symptoms persist after the first, and then specialist referral. Worth knowing, because “antibiotics do not help” is easy to read as a refusal of that, and it is not.
- What the trials rejected is PROLONGED or intravenous treatment beyond that point. Klempner, PLEASE, and the other randomised trials tested extended courses and found no benefit. They do cause harm — line infections, C. difficile, drug reactions. This is one of the better-evidenced negatives in medicine, and it is the reason UK clinicians decline months of treatment, not the reason they decline a second course.
- The term you will meet is “post-treatment Lyme disease symptoms” — worth knowing, because the phrase people are more often given online is “chronic Lyme”, which is used to mean several different things and is what most private testing is sold against.
- That is not the same as saying the symptoms are imagined, and the two get conflated constantly. Persisting symptoms after an infection are well documented across many infections. The argument is about the mechanism and the treatment, not about whether the person is unwell.
- Be careful with private and overseas testing. Laboratories offering tests not validated against the standard two-tier approach return positive results at rates far above the true prevalence, and a false positive leads to months of unnecessary antibiotics and a diagnosis that closes off other explanations. If a private test is positive, the right next step is an NHS-validated test, not treatment.
- And the more useful question is often what else it could be. Thyroid disease, anaemia, sleep apnoea, depression and vitamin deficiency all present this way and all are treatable — see which tests are worth having. A Lyme label that has stopped anyone looking is doing harm of its own.
- What does help is unglamorous and overlaps entirely with the nociplastic pain approach: graded activity, sleep treated as a target, and symptom-specific management. That is not a consolation prize; it is the intervention with evidence behind it.
9. When to seek help
- An expanding rash after a possible tick exposure — this needs treatment, not observation.
- Facial droop, new severe headache, neck stiffness, confusion, unsteadiness, or limb weakness — whether or not you remember a bite.
- Fainting, chest pain or a very slow pulse in the weeks after a bite.
- Spreading redness that is hot and painful and worsening after day two — that is more likely cellulitis, and also needs antibiotics.
The rest of the bites and stings material — insect stings, animal and human bites, and the British wildlife people worry about — is in the bites chapter.