Kissing Bug: How to Identify It, What a Bite Means, and Your Real Chagas Risk

What is a kissing bug?

A kissing bug is a blood-feeding insect in the subfamily Triatominae, a small group within the assassin bug family. CDC counts 11 kinds in the United States. They feed on the blood of animals and people, mostly at night, and they can carry Trypanosoma cruzi, the parasite that causes Chagas disease.

You will also see them called conenose bugs, triatomines, or chinches. Texas A&M says the “kissing” name comes from an old belief that they mostly bite around the mouth and eyes. In fact they bite any skin they can reach, and the bite is usually painless because their saliva numbs the spot.

Every kissing bug is an assassin bug, but almost no assassin bug you find in a garden is a kissing bug. Garden assassin bugs hunt insects and bite only in self-defense, with instant, burning pain. Our guide to garden assassin bugs and their bite covers those. This page is about the blood feeders.

How to identify a kissing bug

Check 5 things. A kissing bug has a long, cone-shaped head with bulging eyes. Its thin, straight beak sits tucked under the head, and its legs are thin with no thick or spiny parts. The flat body is dark brown or black, with red, orange or yellow stripes around the edge. Most US kinds are 1/2 to 1 inch long.

Texas A&M, which has identified thousands of bugs sent in by the public, says all US kinds are mainly black or very dark brown. The edge of the abdomen flares out past the folded wings, so the stripes show as a band of colored blocks around the body. Penn State adds that from behind the bug looks almost triangular.

The 11 kinds of kissing bugs in the US

Which kissing bug you have depends mostly on where you live. CDC lists the size and the states for each of the 11 US species. Four of them, according to a 2025 review in CDC’s journal Emerging Infectious Diseases, are the ones commonly found in homes: Triatoma sanguisuga, T. gerstaeckeri, T. protracta and T. rubida.

Sizes and states from CDC, Triatomine Bugs in the United States (updated February 2026). Home-dwelling species from Beatty and others, Emerging Infectious Diseases, September 2025. Stripe colors and the protracta note from Texas A&M. Genus note from Penn State Extension. Phoenix and Tucson from University of Arizona Cooperative Extension.

Kissing bug nymphs and eggs

Young kissing bugs, called nymphs, look like small, wingless adults with the same cone-shaped head. Texas A&M says they pass through 5 stages before they grow wings, and the University of Arizona says each stage needs a full blood meal. Eggs are small, oval and light-colored, and the University of Arizona says they hatch in 3 to 5 weeks.

Nymphs matter more than adults when you find them indoors. Adults fly in from outside, often drawn by lights. Nymphs cannot fly, so CDC says finding young, wingless ones in a house may mean the house is infested. That is the time to call a pest professional rather than just removing the one you saw.

Kissing bug look-alikes

Most bugs people send in as kissing bugs are something else. The wheel bug is the most common mix-up, followed by other assassin bugs, the western conifer seed bug, leaf-footed bugs and boxelder bugs. Check 3 things: the beak, the legs and the head.

A kissing bug has a straight beak that is not thick or curved, thin legs with no flares or spines, and a long cone-shaped head. Only a bug with all of these is likely to be one. Ohio State names the wheel bug as the bug most often mistaken for a kissing bug, and Penn State lists it first among the look-alikes. Texas A&M adds a key rule: no insect other than a kissing bug is known to carry the Chagas parasite. So once you rule out a kissing bug, the disease question is settled, even if the bug can still bite.

Features from Penn State Extension (2026), Ohio State BYGL (2025), Colorado State University Extension (2025) and Texas A&M Insects in the City. Stink bug shape from the Missouri Department of Conservation.

Each of these has its own page here. For the wheel bug and the other predatory assassin bugs, see our assassin bug identification guide. The red and black bug on your siding in fall has its own boxelder bug page. For big brown bugs on tomatoes, see the leaf-footed bug guide.

Fall brings the most false alarms. Colorado State says western conifer seed bugs come indoors from September through November. So a large brown bug inside the house in fall is far more likely to be one of these. Check the back legs: the seed bug has a flat, leaf-like flare on each one.

Where kissing bugs live: states and habitats

Kissing bugs live across the southern half of the United States. Texas A&M’s website says they have been found in 29 states, and a 2025 review citing CDC says 32. The most kinds and finds come from Texas, New Mexico and Arizona. Texas A&M’s map shows none in New England or the Northwest.

Why do sources say 27, 29 or 32 states? They count at different times, and a single old record can add a state. The 2014 Klotz review said 27, Texas A&M says 29, and the 2025 Emerging Infectious Diseases review says 32. A record means someone found at least one bug there, not that they are common.

Kissing bugs by state

The table below brings together CDC’s species list and Texas A&M’s map of historical records for the states people search most. In the Southeast and Midwest, most people meet the eastern conenose, Triatoma sanguisuga. CDC reports it from Texas to Pennsylvania.

Species by state from CDC (February 2026); the eastern conenose’s eastern range from Klotz and others (2014) and Penn State Extension. Presence and rare states from Texas A&M’s map of historical records and FAQ. Colorado from Colorado State University Extension; Ohio from Ohio State BYGL (September 2025); San Diego from Klotz and others (2014). No record in a state does not prove kissing bugs are absent.

Where kissing bugs hide

Outdoors, kissing bugs live close to the animals they feed on. CDC lists the spots: beneath porches, under cement, and in rock, wood and brush piles. They also hide under bark, in rodent nests and burrows, in dog houses and kennels, and in chicken coops. Woodrat and packrat nests are a favorite, and Texas A&M names raccoons, opossums and coyotes among their hosts.

Indoors, CDC says they hide near where pets sleep, where rodents are, and around beds, especially under or near mattresses and nightstands. The University of Arizona says a bug that fed overnight often turns up in the bedding or the drapes the next morning. Even so, CDC says kissing bugs rarely infest US homes, because most are well sealed.

When kissing bugs are active

Kissing bugs are most active from spring to fall, and almost always at night. Texas A&M’s kissing bug program says they are most active in Texas from May through September. In its 2015 study of bugs sent in by the public, submissions peaked in June and July. In Arizona, the University of Arizona puts the main flight season in May through July.

During the day they hide in cracks, nests and piles. At dusk and after dark, adults fly in search of a meal. Lights draw them in, so people often find them near porch lights and doors. The Klotz review describes the active season as roughly mid-spring to mid-fall, with dispersal flights before or during the summer monsoon in the Southwest.

If a kissing bug bites you

A kissing bug bite is usually painless, because the saliva numbs the skin, so most people do not wake up. It tends to be a small, raised red bump with a tiny hole in the middle, on the face, neck, arms or legs, and it fades within 1 to 2 weeks. You cannot tell what bit you from the bite alone, so identify the bug.

The bigger risk in the US is an allergic reaction, not Chagas, and the signs below need 911. For an ordinary bite, wash it with soap and water and do not scratch, since scratching can rub droppings into it. Our kissing bug bite guide covers the bite mark, a symptom timeline, first aid, the allergy numbers, and when a Chagas test makes sense.

Chagas disease: how big is your risk?

The risk of catching Chagas from a kissing bug in the US is low, but not zero. About 1 in 2 bugs tested in Texas carry the parasite. Yet Stephen Klotz, a University of Arizona physician who studies Arizona kissing bugs, thinks the parasite gets rubbed into a bite maybe once in several thousand bites there.

One reason is timing. His 2014 review says southwestern kinds often leave droppings only after they finish feeding and move away. The 2025 review notes that the main Texas and eastern kinds sometimes leave droppings while they feed, which could raise the risk a little there, though local cases are still rare. Infection happens when the bug’s droppings get into the bite wound, the eyes, the mouth or a cut. CDC is clear that Chagas does not spread from person to person like a cold. Rarely, it can also pass from a mother to her baby, or through blood transfusions, organ transplants, lab accidents, or contaminated food or drink.

The numbers in the United States

CDC estimates about 280,000 people in the US have Chagas disease, often without knowing it. The Klotz review notes that most of them caught it in Latin America before moving here. Locally acquired cases are much rarer. An earlier review, cited in a 2025 paper, found 29 confirmed and 47 suspected locally acquired cases in 2000 to 2018, and Texas recorded 50 locally acquired cases in 2013 to 2023.

Is Chagas endemic in the US now? That 2025 review, in CDC’s journal Emerging Infectious Diseases, argued it should be called endemic at a low level. Locally acquired Chagas has been found in people in 8 states: California, Arizona, Texas, Tennessee, Louisiana, Missouri, Mississippi and Arkansas. Its authors were university and Texas health department scientists, not CDC staff.

The same review says the local burden “does not approach the levels seen in some regions of Latin America”. So the headlines in 2025 were about a label, not a sudden outbreak, and the review found that Texas cases did not rise from 2013 to 2023.

Chagas symptoms

Most people have mild symptoms or none at all at first. CDC lists the early, or acute, signs as fever, tiredness, body aches, headache, rash, loss of appetite, diarrhea, vomiting and swelling of one eyelid. Years later, about 20 to 30% of infected people develop serious heart or gut problems. These include an enlarged heart, heart failure, an irregular heartbeat, or an enlarged esophagus or colon.

One caution about eyelid swelling. CDC lists it as a sign of early Chagas, called Romaña’s sign. But the Klotz review notes that in the US, a swollen eyelid after a bite is more often an allergy to the bug’s saliva. Either way, it is a reason to see a doctor and mention the bug.

Testing and treatment

Doctors diagnose Chagas with blood tests. For long-term infection, CDC says no single test is enough, so doctors use two or more antibody tests that work in different ways. A new infection can sometimes be seen in a blood sample under a microscope. The University of Arizona says finding a bug or being bitten does not by itself mean you need testing. See a doctor if symptoms appear, and ask about testing if you lived in Latin America or your mother has Chagas.

Doctors can treat Chagas. CDC says two medicines are FDA approved: benznidazole, for children 2 to 12, and nifurtimox (sold as Lampit), for children from birth to age 17. Doctors also use them for adults. CDC strongly recommends treatment for adults up to age 50 with long-term infection who do not already have advanced heart disease. Treatment works best when started early.

Many doctors in the US rarely see Chagas. If yours is unsure, CDC runs an inquiry line for health care providers at 404-718-4745. There is no vaccine, and no medicine prevents infection after a bite.

Kissing bugs, dogs and cats

Dogs are at higher risk than people, mainly because they eat kissing bugs. Scientists think eating the bugs is the main way dogs get infected, a 2025 review says. A 2025 review found infection in 10% to more than 50% of dogs tested in parts of Texas. Dogs in kennels and dogs that live outdoors are at higher risk.

An infected dog may look healthy for months or years. The Texas A&M Veterinary Medical Diagnostic Laboratory says the signs look like heart disease: tiredness, poor appetite, trouble breathing, and sometimes sudden death. A vet can order a blood test. Treatment options are limited, and there is no vaccine.

Cats can catch it too, though researchers know less about them. Texas reported 2 cat cases in 2013 to 2015, along with hundreds of dog cases. CDC advises having pets sleep indoors, especially at night, and cleaning their resting areas often.

What to do if you find a kissing bug

If you find a kissing bug, do not touch it or squash it. Trap it in a jar or a sealed bag and freeze it for a few hours. Then note where and when you found it, and send a photo to be identified. These 7 steps follow advice from Texas A&M and Ohio State.

One bug is not an infestation. Adults often fly in alone, drawn by lights. Reddit threads titled “Found kissing bug. How worried should I be there are more?” show how common that fear is. Look for more in the bedroom, near pet beds and along baseboards. Finding nymphs, or several bugs over a few weeks, is the sign to call a professional.

How to keep kissing bugs out of your home

Keeping kissing bugs out takes 3 things: seal the way in, dim the lights, and remove the nests and piles they live in. CDC says to seal cracks and gaps, repair screens, close off attics and crawl spaces, and move wood, brush and rock piles away from the house.

• Seal gaps around doors, windows, pipes and baseboards, and add weather stripping and door sweeps.
• Fix screens and do not leave doors open after dark without one.
• Change outdoor lights. CDC says to keep yard lights away from the house. Switch porch bulbs to yellow or low-UV LED, or turn them off at night if that is safe.
• Move woodpiles and brush away from the walls, and keep the area under porches clear.
• Deal with rodents. The University of Arizona advises having a professional remove packrat nests close to the house.
• Bring pets in at night, and keep dog beds and kennels clean.
• Draw curtains at night so indoor light does not draw bugs to the windows.
• Use a bed net if you already react badly to bites. CDC says properly treated bed nets work.

Do not count on store-bought traps. CDC says roach traps do not work on kissing bugs, although Penn State notes that glue traps can show whether any are present. Use them as a check, not a fix.

Kissing bug myths

Kissing bug news stories spread fast, and at least 8 common claims are wrong or out of date. Some come from pages that rank well on Google, and some from forum posts. Here is what each one gets wrong, with the source that corrects it.

• Myth 1

  Myth: “Kissing bugs mostly bite your lips.”

  Truth: Texas A&M calls this an old belief. They bite any skin they can reach in bed, which is often the face but also the neck, arms and hands.

• Myth 2

  Myth: “The bite gives you Chagas.”

  Truth: The parasite is in the droppings, not the saliva or bite, Texas A&M says. Someone has to rub it into the bite, the eyes or the mouth.

• Myth 3

  Myth: “Every kissing bug is infected.”

  Truth: About half are, in Texas A&M's testing, and the rate ranges from 11% to 67% depending on the species.

• Myth 4

  Myth: “Kissing bugs are 1-1/2 to 2 inches long.”

  Truth: A Reddit answer says this. CDC's sizes run from 0.5 to 1.3 inches, and most kinds are under 1 inch.

• Myth 5

  Myth: “Kissing bugs have no wings.”

  Truth: One health library page says they are wingless. Adults have wings and fly, Texas A&M says. Only nymphs lack wings.

• Myth 6

  Myth: “All assassin bugs can give you Chagas.”

  Truth: Texas A&M says no insect other than kissing bugs is known to carry the parasite. Garden assassin bugs bite, but they carry no disease.

• Myth 7

  Myth: “Kissing bugs infest homes the way bed bugs do.”

  Truth: CDC says they rarely infest US homes. One adult indoors is usually a visitor that flew in toward a light.

• Myth 8

  Myth: “Chagas has no treatment.”

  Truth: CDC lists two FDA-approved medicines, benznidazole and nifurtimox, which work best when started early.

When to call someone

Most people need only to trap the bug and get it identified. Call for help in 4 cases: a severe reaction to a bite, or illness in the weeks after a known bite. A dog with signs of heart trouble is the third, and more than one bug indoors, especially nymphs, is the fourth. Here is who to call.

• 911 for trouble breathing, a swollen face or throat, hives over the body, or fainting after a bite.
• A doctor after a known bite, especially if you get a fever, feel ill, or one eyelid swells in the following weeks. Take the bug.
• The Texas A&M kissing bug program to identify a bug from a photo, from any state.
• The Texas Department of State Health Services if you live in Texas and the bug bit someone.
• Your county extension office or state health department for local identification help.
• Your vet if your dog may have eaten a kissing bug, or shows tiredness, breathing trouble or poor appetite.
• A licensed pest professional if you find nymphs indoors or keep finding bugs over several weeks.
• Your landlord if you rent and bugs get in through gaps or broken screens you cannot fix.

If you are still not sure what you found, take a sharp photo from above and from the side, and try our bug identifier by picture. Then confirm a possible kissing bug with an expert.

Pest control disclaimer. Photo-based identification can help, but it is not always perfect. For dangerous spiders, large infestations, or anything you are unsure about, contact a licensed pest control professional.

Medical disclaimer. This page is for general information only. It is not a medical diagnosis. If you have severe symptoms, trouble breathing, swelling of the face or throat, fast spreading redness, fever, severe pain, pus, or signs of infection, contact a doctor or your local emergency number.