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Don't panic! It's very rare to get bitten by a spider in the UK. Of the 650 species found here, only around 12 have been known to bite humans. One of the best-known culprits is the false widow, but it will only attack if provoked. Spider bites leave small puncture marks, which can become painful and swollen. But most will clear up within 24 hours.
How to get rid of spiders and deter them
Found in grass and woodland, ticks latch on to the skin and suck blood. They resemble very small spiders and can be tricky to spot at first – but can swell to the size of a pea after feeding. Some ticks transmit Lyme disease, a serious bacterial infection, so it's important to remove them promptly. Use a tick remover (£5.50, www.lymediseaseaction.org.uk), rather than tweezers.
Bite prevention expert Howard Carter advises: 'Take the bite out gently and hold it vertically above your skin. The chance of contracting Lyme is far less if you remove the tick without squashing its insides back into your skin.' If you develop flu-like symptoms and/or a red, circular rash around the bite, seek urgent medical advice.
Learn more about Lyme disease
My Lyme Disease story
They may look pretty, but ladybirds do bite – particularly when they can't get enough food or water. Harlequin ladybirds – which have white spots on their heads – are the most likely to attack. Their bites can be painful for a few hours, but are rarely cause for concern.
Learn more about ladybirds
If you're in the south-east of England, beware of the caterpillars of the oak processionary moth – particularly in late spring and summer. They're easy to spot as they move up and down trees in nose-to-tail processions.
The problem? Their hairs can cause an itchy rash, eye infections and sore throat, as well as occasional fever and breathing difficulties. Report any sightings to the Forestry Commission (www.forestry.gov.uk) – and consult your doctor if you think you may be having a severe allergic reaction.
Fleas from pets tend to bite around the ankles. They cause tiny, itchy red lumps that often appear in clusters. Check your cat or dog regularly for fleas, and use a good preventative treatment. Remember, fleas can be particularly dangerous in young animals.
Common flower bugs have tiny oval bodies, reflective wings and orange-brown legs. Their bites can be painful and very itchy, and may take a while to heal – so do take care when you're gardening.
Wasp stings cause a sudden, sharp pain followed by a swollen red mark that may be itchy and painful. The discomfort normally only lasts a few hours, but can last a while longer if you experience an allergic reaction. Seek medical advice if you have any concerns.
Bee stings are very similar to those of wasps, but the sting is often left behind. The trick is to scrape it out sideways with a hard-edged object, such as a bank card. Avoid tweezers as they can spread the venom.
Learn more about bees
Although rare, leeches are found in wetland areas of the UK - particularly in Kent. A type of segmented worm, they have large oral suckers, which they use to latch on to the skin and suck blood. Their bites are surprisingly painless.
Spotted one on you? Stay calm! To remove it, slide your fingernail towards the wound and gently push the sucker sideways – then quickly pull the fatter end of the leech away from your skin. Keep the wound clean.
These large, hairy flies are found around farm animals, ponds and grass – and are particularly pesky when it's hot. Their hugely painful bites cut, rather than pierce, the skin, so take longer to heal and are prone to infection. Red and raised, they may be accompanied by a larger rash and can also cause dizziness and wheezing.
Found around livestock and on beaches, these brown flies have an easy-to-spot proboscis, which they use to deliver a painful, needle-like bite in order to feed on blood. They're particularly active during the daytime and tend to target the lower legs and ankles, so do protect yourself with insect repellent.
Found mainly in woodlands, black flies tend to fly in swarms. Their ferocious bites are shallow but sore, and can quickly become swollen, itchy and irritated.
Found on beaches and marshes, these midge-like flies cause raised, red bumps that may turn into a rash. These bites are incredibly itchy and can occasionally become infected. Sand flies are most active around dusk and dawn and tend to target exposed areas such as the face and hands.
Mosquito bites are tiny red lumps that can be incredibly itchy and may form blisters. To prevent infection, resist the urge to scratch or burst any blisters. Mosquitoes are most active around dusk and dawn.
Avoid being bitten by covering up with light-coloured clothing, steering clear of fragranced products and using a good repellent. Mosquitoes don't spread disease in the UK – but consult your doctor or travel clinic if you're travelling to a malaria zone abroad.
How to deal with mosquitoes
Midges and gnats
Midges and gnats thrive on damp summer days, often travelling in swarms. Similar to mosquito bites, they cause tiny red lumps that can be painful, itchy and swollen and may develop into blisters. Again, the trick is not to scratch in order to speed up the healing process. Protect yourself by using a citronella soap or body wash and using repellent.
Common black ants don't bite or sting – but red ants, wood ants and flying ants might do if disturbed or threatened. You'll feel a tiny nip and a pale pink mark may appear on your skin. In rare cases, the bite can become painful, itchy or swollen.
In the vast majority of cases, a bite or sting will clear up within a few days. Wash the area with soap and water and keep it raised to reduce swelling. Over-the-counter treatments such as anti-itch creams and antihistamines can help. But if symptoms worsen or the area appears infected, do seek immediate medical advice.