North Carolina’s mix of mountains, piedmont, and coastline creates habitat for a wide range of biting bugs, from ticks carrying serious diseases to coastal midges that leave itchy welts. What bites you depends heavily on where in the state you are, what time of year it is, and whether you’re outdoors in wooded, grassy, or waterside areas. Here’s what you’re most likely to encounter and what actually matters for your health.
Ticks: The Biggest Health Concern
Tick-borne illness is the most serious bug bite risk in North Carolina. Three diseases account for the bulk of cases, and each is carried by a different tick species that thrives in different parts of the state.
Ehrlichiosis was the most frequently reported tick-borne disease in North Carolina in 2024, with 278 confirmed and probable cases. It’s transmitted by the lone star tick, which is common statewide but causes the most infections in the western and central regions. Symptoms typically include fever, headache, muscle aches, and fatigue, appearing one to two weeks after a bite.
Lyme disease followed close behind with 247 cases in 2024, spread by the blacklegged tick. Incidence is highest in the northwestern mountains, particularly in counties bordering Virginia and Tennessee. Yancey, Mitchell, Madison, Alleghany, and Ashe counties all exceeded 30 cases per 100,000 residents, rates far above the statewide average of 2.2 per 100,000.
Spotted fever rickettsiosis (the group that includes Rocky Mountain spotted fever) accounted for 195 cases in 2024, carried primarily by the American dog tick. Unlike the other two diseases, spotted fever risk is spread across all three regions of the state, from the mountains through the piedmont to the coastal plain. It can be life-threatening without prompt treatment.
Alpha-Gal Syndrome From Lone Star Ticks
The lone star tick is responsible for more than just ehrlichiosis. Its bite can trigger alpha-gal syndrome, a delayed allergic reaction to red meat and other mammalian products. Symptoms, including hives, swelling, gastrointestinal distress, and sometimes anaphylaxis, typically appear several hours after eating beef, pork, or lamb, which makes the connection easy to miss.
A 2025 UNC study found that in the highest-risk states (a belt from Arkansas to Virginia that includes North Carolina’s neighbors), nearly one in four adults tested positive for alpha-gal antibodies. Diagnosis requires both a history of delayed reactions after eating mammalian products and a positive blood test. Not everyone with antibodies develops symptoms, but the condition is far more common than most people realize.
Mosquitoes and Mosquito-Borne Viruses
La Crosse encephalitis is the most common mosquito-borne virus in North Carolina, occurring mostly in the western part of the state. It’s spread by the treehole mosquito, which is active during daytime hours from spring through late fall. The virus can cause inflammation of the brain, and children are most often affected. West Nile virus also circulates in the state but is less frequently reported.
Unlike many mosquito species that bite at dusk and dawn, the treehole mosquito feeds during the day, so standard advice about avoiding evening outdoor activity doesn’t fully apply in western North Carolina’s wooded areas.
Venomous Spider Bites
Two medically significant spiders live in North Carolina: the black widow and the brown recluse.
Black widows are the more commonly encountered of the two. The adult female is the one to watch for: a shiny black body about half an inch long with a red hourglass marking on the underside of the abdomen. Young black widows look completely different, with tan-to-gray coloring and orange and white stripes. The bite itself can be mild enough that you don’t notice it immediately. Black widow venom affects the nervous system, and severe bites cause pain in the lymph nodes, nausea, elevated blood pressure, sweating, and tremors. An antivenom exists but must be administered quickly.
Brown recluse spiders are about a quarter to half inch long, with a dark violin-shaped mark on top of the head area (the “neck” of the fiddle points toward the rear). Their most distinctive feature is six eyes arranged in three pairs, unlike the eight eyes of most spiders. A brown recluse bite may go unnoticed for three to eight hours before the area reddens, swells, and becomes tender. Blistering follows, and in some cases a patch of dead skin tissue develops that may require surgery. Prompt medical attention matters significantly for outcomes.
Coastal and Outdoor Nuisance Biters
If you’re visiting the North Carolina coast, biting midges (often called no-see-ums or sand gnats) are nearly unavoidable during warm months. These tiny flies breed in salt marshes, intertidal sand, and decaying seaweed that washes up after storms. They’re present throughout most of the warm weather season along the coast and around inland breeding sites near fresh water. Only the females bite, taking blood meals to produce eggs. Their bites are intensely itchy relative to the insect’s size.
Horse flies and deer flies are common near water and wooded areas statewide and deliver painful bites. Black flies breed near running water and are another daytime biter. Chiggers, which are larval mites, are widespread in grassy and brushy areas during summer and early fall. They don’t actually burrow into skin as commonly believed, but their feeding causes intensely itchy red welts that can last for days.
Fire Ants
Red imported fire ants have spread throughout North Carolina and are a year-round concern in the piedmont and coastal plain. Their stings produce a burning sensation followed by white, fluid-filled pustules that form within a day. Multiple stings are common because disturbing a mound triggers a coordinated attack. For most people the stings are painful but not dangerous, though allergic reactions do occur.
How to Prevent Bites
DEET remains the most effective and widely studied repellent. Products with about 10 percent DEET protect for roughly two hours, while a 24 percent concentration provides about five hours of coverage. For children over two months old, concentrations up to 30 percent are considered safe. Do not use DEET on infants younger than two months.
Picaridin and oil of lemon eucalyptus are CDC-recommended alternatives, though their protection duration is comparable to about 10 percent DEET. Permethrin is highly effective against ticks but should only be applied to clothing, never skin, and must dry completely before you wear the treated garment.
A few practical rules make repellents work better: apply only to exposed skin, not under clothing. Don’t spray your face directly; spray your hands first, then apply. Avoid combining repellent with sunscreen in a single product. When you come inside, wash treated skin with soap and water, and wash treated clothing before wearing it again. With children, apply the repellent to your own hands first, then rub it on the child, keeping it away from their hands, eyes, and mouth.
Signs a Bite Needs Emergency Care
Most bug bites in North Carolina cause temporary discomfort and resolve on their own. But certain reactions signal something more serious. Swelling that expands beyond four inches from the bite site suggests an allergic reaction. Trouble breathing or swallowing, throat or tongue swelling, hives spreading across the body, dizziness, or a rapid pulse after a bite or sting are signs of anaphylaxis.
For spider bites specifically, watch for muscle pain or spasms that spread beyond the bite area, excessive sweating, nausea, and abdominal cramping, which can indicate black widow envenomation. A bite that develops a growing area of redness, blistering, or darkening skin over hours could be a brown recluse bite. In either case, getting medical attention quickly improves outcomes considerably.