Ticks are tiny, blood-feeding parasitic arachnids, not insects.
They attach to people and animals, and some can spread tick-borne diseases through a bite.
Because ticks can be as small as a poppy seed during the nymph stage, you should learn what ticks look like and check your skin after outdoor time to act quickly.
You can reduce your risk by avoiding dense vegetation and using an effective repellent.
Check your body and pets, and promptly remove an attached tick with fine-tipped tweezers.
Most tick bites do not cause illness, but some ticks carry bacteria, viruses, or other pathogens that can cause serious diseases.
How To Recognize a Tick
Ticks belong to the order Ixodida within the mite group Acari, class Arachnida, and superorder Parasitiformes.
They have eight legs as nymphs and adults, an oval body, and specialized mouthparts for piercing skin.
Appearance Before and After Feeding
An unfed tick may look like a tiny flat seed, with color ranging from reddish brown to gray.
After feeding, its body expands dramatically and may become rounded or balloon-shaped.
A tick’s front feeding structure is the gnathosoma, which includes the hypostome, chelicerae, and palps.
The hypostome helps anchor the tick, while the chelicerae cut the skin and the palps sense the surrounding area.
Hard Ticks
Hard ticks mainly belong to the family Ixodidae.
A firm dorsal shield called the scutum covers part of the body.
In females, the scutum covers only the front portion, allowing the body to expand during feeding.
Common hard ticks in the United States include the Ixodes group, such as the deer tick or black-legged tick.
Other types include the lone star tick in the genus Amblyomma, American dog ticks in Dermacentor, brown dog ticks in Rhipicephalus, and some Haemaphysalis species.
Markings can help with identification, but a clear photograph or professional identification is more reliable than guessing.
Soft Ticks
Soft ticks belong to the family Argasidae.
They lack a scutum and usually have a leathery, wrinkled appearance.
Their capitulum, or mouthpart structure, is tucked beneath the body instead of projecting visibly from the front.
Genera include Argas and Ornithodoros.
The family Nuttalliellidae contains the African tick Nuttalliella namaqua.
Fossil lineages include Khimairidae, Archaeocroton, and Bothriocroton.
Where Ticks Wait for Hosts
Ticks do not fly or jump.
They often wait in leaf litter, tall grass, shrubs, and the transition between lawn and vegetation, called an ecotone.
During questing, a tick climbs onto nearby vegetation and holds out its legs until a passing host brushes against it.
How Ticks Feed and Develop
Ticks detect potential hosts through odors, body heat, moisture, air movement, and vibrations.
Their life cycle has four stages, and each blood meal can support growth, molting, or reproduction.
Questing and Host Detection
A tick climbs vegetation and extends its front legs during questing.
Sensory structures on its legs help it detect chemicals, warmth, and movement from mammals, birds, amphibians, and other hosts.
When the tick contacts you, it may crawl for several hours before choosing a feeding site.
It often seeks warm, protected areas such as the scalp, waist, groin, armpits, or behind the knees.
From Egg to Adult Tick
Ticks begin as an egg.
They hatch as six-legged larvae and gain eight legs after molting into the nymph stage.
Nymphs are especially easy to miss because they can be smaller than a sesame seed.
Many hard ticks follow a three-host life cycle.
The larva, nymph, and adult tick each feed on a separate host, detach, and then molt or reproduce.
Adult ticks mate, females take a large blood meal, and the female lays eggs before dying.
How Pathogens Reach People
During feeding, tick saliva helps the tick remain attached and obtain blood.
If the tick carries bacteria, viruses, or other pathogens, those organisms may enter the host through saliva or regurgitated fluids.
A tick is not automatically infectious.
Transmission depends on the species, life stage, pathogen, and feeding conditions.
Prompt removal limits the time available for some pathogens to spread.
After a Tick Bite: Removal, Symptoms, and Care
If you remove the tick promptly, you lower exposure time and can record the tick’s appearance.
Watch the bite area and your health for several weeks, since symptoms can appear days or weeks after exposure.
Safe Tick Removal With Tweezers
- Use clean, fine-tipped tweezers.
- Grasp the tick as close to the skin as possible.
- Pull upward with steady, even pressure.
- If mouthparts remain in the skin and you cannot remove them easily, leave them alone and let the skin heal.
- Clean the bite and your hands with soap and water or an alcohol-based cleanser.
- Dispose of the tick in alcohol, a sealed container, or wrapped tape. Do not crush it with bare fingers.
Avoid petroleum jelly, heat, nail polish, and twisting or jerking the tick.
Keep a photo or the tick itself only if a healthcare professional asks for it, since testing policies differ.
Symptoms That Need Medical Advice
A small red spot can occur after a bite and may fade within a few days.
Contact a healthcare professional if you develop fever, chills, fatigue, headache, muscle aches, muscle pain, joint pain, nausea, rash, neck stiffness, or shortness of breath.
An expanding rash known as erythema migrans can be a sign of Lyme disease.
Not everyone develops it and it may not form a classic bull’s-eye.
Seek urgent care for trouble breathing, facial weakness, severe headache, confusion, widespread rash, or rapidly worsening illness.
Diseases Ticks Can Transmit
Depending on region and species, tick bites may transmit Lyme disease, Rocky Mountain spotted fever (RMSF), ehrlichiosis, anaplasmosis, babesiosis, STARI (southern tick-associated rash illness), tularemia, Colorado tick fever, tick-borne relapsing fever, and Q fever.
Ticks can also cause tick paralysis and trigger alpha-gal syndrome, an allergy to certain mammalian products.
Important organisms include Borrelia, Rickettsia, and Coxiella burnetii.
The CDC’s tick-bite guidance recommends prompt removal and medical follow-up when symptoms develop.
Reducing Tick Exposure Outdoors and at Home
Limit contact with tick habitat, use a suitable repellent, keep vegetation managed, and check your body, clothing, gear, and pets after outdoor activity.
These habits help whether you spend time hiking, gardening, camping, or playing in your yard.
Choose Effective Repellents and Clothing
Use an EPA-registered tick repellent containing DEET, picaridin, IR3535, oil of lemon eucalyptus, or another approved active ingredient.
Follow the label, especially for children and reapplication.
Treat clothing and gear with permethrin products labeled for that purpose, or buy pretreated clothing.
Wear light-colored long pants and socks, tuck pant legs into socks, and stay near the center of cleared trails.
The EPA’s tick-bite prevention tips explains how repellents and exposed-skin coverage work together.
Make Yards Less Tick-Friendly
Ticks favor shaded, damp tick habitats, including woodlands, brush, and leaf litter.
Mow grass regularly, clear leaves and brush, trim vegetation near play areas, and create a dry gravel or wood-chip border between lawns and wooded areas.
Move woodpiles and outdoor furniture away from dense vegetation.
Reduce places where rodents and deer gather, since these animals can carry ticks into your yard.
Check People and Pets After Outdoor Time
Check your clothing and skin as soon as you come indoors. Pay close attention to the hairline, ears, waist, groin, armpits, and behind the knees.
Shower soon after outdoor exposure to help remove unattached ticks. Put worn clothing in a hot dryer before washing when practical, because heat kills ticks.
Examine dogs and cats carefully. Use veterinarian-approved tick control and check collars, toes, ears, and between the legs.
