A centipede bite causes immediate, intense burning pain followed by swelling and redness around the wound. For most people, the pain and swelling resolve on their own within a few days to a week, though symptoms can linger for up to three weeks in some cases. The severity depends almost entirely on the size of the centipede: a common house centipede barely has enough venom to break the skin, while a large tropical species can cause serious complications.
What It Feels Like Right Away
The moment a centipede’s fangs (technically called forcipules) pierce the skin, you’ll feel an excruciating burning pain at the bite site. This isn’t just a pinch. People consistently describe it as one of the more painful arthropod stings, sometimes compared to a wasp sting but more sustained. The area quickly becomes red and swollen, and you may notice hard, raised tissue forming around the puncture marks.
Centipede venom is a complex cocktail of compounds that act on pain receptors, blood cells, and surrounding tissue. It contains substances that interfere with ion channels in your nerves, which is why the pain feels so disproportionate to the size of the wound. Some people also experience chills, fever, and general weakness in the hours following a bite, even when the bite itself isn’t medically dangerous.
Anxiety and panic are also commonly reported, partly because centipede bites tend to happen unexpectedly (in a shoe, under a pillow, while gardening) and partly because the pain itself can be alarming.
House Centipedes vs. Large Species
If you were bitten by a common house centipede, the kind with long, spindly legs that darts across your bathroom floor, you can relax. These centipedes are only about 1 to 1.5 inches long and simply don’t carry enough venom to cause meaningful symptoms in humans. Most house centipede bites go unreported because they’re so mild. At worst, you might get a small histamine reaction similar to a mild bee sting.
The centipedes responsible for serious bites belong to the Scolopendra family, which includes species found in tropical and subtropical regions across Hawaii, the southern United States, Central America, Asia, and the Pacific Islands. These centipedes can reach up to 12 inches long, and their larger bodies store significantly more venom. The vast majority of medically documented centipede bites come from Scolopendra species.
How Long Symptoms Last
For a typical bite from a large centipede, pain is worst in the first few hours and then gradually fades. Swelling and redness generally resolve within a few days to one week. In some cases, particularly with larger species or bites on sensitive areas like the hands or feet, pain and swelling can persist for up to three weeks.
You’ll likely see two small puncture marks where the fangs entered, surrounded by a red, swollen area. The skin may feel warm to the touch. Some people develop bruising or discoloration that outlasts the pain itself.
Rare but Serious Complications
Most centipede bites are painful but not dangerous. However, large centipedes can occasionally cause complications that go beyond localized pain.
- Tissue death around the bite. Some bites cause the skin and tissue at the wound site to break down, requiring medical cleaning and sometimes antibiotics.
- Bacterial infection. The puncture wounds can become infected, particularly with staph bacteria. In rare cases, this progresses to a deep, spreading skin infection. Two documented cases involved serious infections of the hand that required aggressive treatment.
- Allergic reaction. Between 1.5% and 5% of centipede bite victims develop a significant allergic response. This can range from widespread hives to full anaphylaxis with difficulty breathing, a drop in blood pressure, and rapid heart rate.
- Heart-related effects. Rarely, centipede venom has caused heart palpitations, blood vessel spasms, and in isolated cases, reduced blood flow to the heart. These cardiovascular effects are uncommon but have been documented in medical literature.
- Muscle breakdown. Called rhabdomyolysis, this is when damaged muscle tissue releases its contents into the bloodstream. It’s very rare with centipede bites but has been reported.
These complications are the exception, not the rule. But they explain why bites from large centipedes deserve attention rather than dismissal.
What to Do After a Bite
Start by washing the bite thoroughly with soap and water. Apply a cold compress or ice wrapped in cloth to reduce swelling and numb the pain. Over-the-counter pain relievers can help take the edge off, and an antihistamine may reduce swelling and itchiness.
Keep the bite area clean and watch it over the next several days. The things to look for are spreading redness, increasing warmth, pus or discharge, red streaks extending away from the bite, or a darkening of the skin at the wound site. Any of these suggest an infection or tissue damage that needs medical attention.
If you develop difficulty breathing, swelling of the face or throat, dizziness, a rapid heartbeat, or widespread hives after a bite, those are signs of a systemic allergic reaction that requires emergency care. Chest pain or heart palpitations, while rare, also warrant immediate evaluation. The bite itself has no antivenom, so treatment focuses on managing pain, controlling allergic reactions, and addressing any secondary infections.
Why the Pain Is So Intense
Centipede venom contains roughly 50 identified active components, including compounds that directly activate pain-signaling nerve channels, substances that break down cell membranes, and molecules that affect blood clotting. This diversity is part of why the sting feels so much worse than you’d expect from such a small wound. The venom essentially hits multiple systems at once: it triggers inflammation, damages local tissue, and floods pain receptors.
The venom also contains serotonin and other signaling molecules that amplify the pain response and contribute to the redness and swelling. For the centipede, this cocktail is designed to subdue prey like insects and small vertebrates. In a human, it’s not enough to cause systemic harm in most cases, but it’s more than enough to make you remember the experience.