Spider Bite Treatment: First Aid, Symptoms & When to See a Doctor

By Jen | BadSpiderBites.com | Last reviewed: April 2026

Close up of a colorful spider ready to bite.

If you think a spider bit you, wash the area with soap and water, apply ice wrapped in a cloth, and keep a close eye on it for the next several hours. Most bites stay mild, but trouble signs are difficulty breathing, severe muscle cramps, fever, vomiting, a wound that keeps spreading or turns dark, or a red line moving away from the bite. If any of that starts, call a doctor or go to the ER. If you did not see the spider, do not guess. Skin infections, ticks, bed bugs, and other bites get blamed on spiders all the time. What matters most is how the wound is changing, how much pain you are in, and whether symptoms are staying local or starting to affect the rest of your body.

Spiders That Can Bite Humans

Most spiders are harmless, but the following species are known to bite and should be taken seriously:

Spider Bite Symptoms

Symptoms vary depending on the spider species and how your body reacts to the venom. Common symptoms include:

Redness and swelling around the bite
Pain or itching at the bite site
Muscle pain or cramps
Headache
Nausea or vomiting
Fever or chills
Difficulty breathing

If you experience difficulty breathing, severe muscle cramps, or a rapidly growing wound, go to the emergency room immediately.

Spider Bite Treatment at Home

For mild bites where you are not experiencing severe symptoms, the following first aid steps are recommended:

Wash the bite site thoroughly with soap and water
Apply an ice pack wrapped in a cloth to reduce swelling and relieve pain
Elevate the affected limb to help reduce swelling
Take over-the-counter pain medication such as ibuprofen or acetaminophen
Take an antihistamine such as Benadryl to reduce itching and swelling

If you are unsure what bit you, or if symptoms worsen after initial first aid, contact your doctor the same day.

When to See a Doctor for a Spider Bite

Seek medical attention immediately if you experience any of the following:

Difficulty breathing or swallowing
Severe muscle cramps or rigidity
A rapidly spreading wound or blackening skin around the bite
Fever, chills, or nausea developing within hours of the bite
A red line extending from the bite toward the body – this can indicate a serious infection

A doctor may do the following depending on severity:

Clean and dress the wound to prevent infection
Prescribe strong pain medication
Administer antivenom if necessary
Monitor heart rate, blood pressure, and other vital signs
Administer intravenous fluids or oxygen therapy

How to Prevent Spider Bites

Keep your home free of clutter, particularly in basements, garages, and storage areas
Seal cracks and gaps in doors, windows, and walls
Shake out clothing, shoes, and gloves before putting them on
Wear long sleeves and gloves when working in areas where spiders are likely to hide
Use insect repellent when spending time outdoors in wooded or rocky areas

What to Do Immediately if Bitten

Do not panic. Follow the first aid steps above, try to identify or photograph the spider from a safe distance, and monitor your symptoms closely. The biggest mistake bite victims make is delaying treatment out of embarrassment or uncertainty. If there is any doubt about the severity of your bite, see a doctor the same day. Early treatment produces significantly better outcomes.

Spider Bite Treatment: A Visitor’s Experience

If you cannot find the spider and are unsure what bit you, or if you have multiple bites, it is more likely to be a tick, bed bug, or another insect rather than a spider. Many doctors have limited experience treating spider bites, and information on identification and treatment can vary widely.

The following is a first-hand account submitted by one of our visitors. It is shared here for informational purposes only. The following account is a personal experience submitted by a visitor. It is not medical advice. Do not attempt to self-medicate. Always consult a licensed physician for diagnosis and treatment of spider bites.

Gerald’s Story: I could write a book about spider bite treatment, but I’ll get to the bottom line. Thanks to our rural Northwest Arkansas farm lifestyle, my wife and I have been bitten by Brown Recluse spiders several times each over the last 20-plus years. Fortunately, we knew a quick, safe, and economical cure for them, so treating it was a 10-minute distraction, making it little more than a mosquito bite.

We learned it from our vet long ago after my first bite went poorly. In our area, farm vets combine a high incidence of personal Brown Recluse bites with a lot of medical knowledge. Who could be more motivated or equipped to find the cure? Vets fix themselves by injecting 1/10th CC of Dexamethasone (cortisone) divided into two or three subcutaneous shots right around the perimeter of the bite-inflamed area. [Dexamethasone is a high-potency steroid used to decrease swelling and inflammation].

He recently said he had used it to treat himself six or more times in his career, plus a few times on his kids and wife. My wife and I together tally about a dozen bites treated that way. I once asked a farm vet in another town where we take horses how he treated his spider bites, and he said the same thing.

Over the years, about two dozen of our friends with bites tried our advice with complete success. That is almost 50 bites given this treatment that I know of, and every single one started to mend immediately.

There were no failures and no negative consequences. Several times a friend told his doctor what he had learned and what he needed to be done, and the doctor did it, usually saying something like, “Sounds reasonable to me. Not all react that way, though. I know the way I’ve been doing it doesn’t work well, and there is no risk with such a tiny dose. There is no downside to trying it.”

None of the bites caught early needed antibiotic treatment, and more than half got none. If a doctor is doing the injections, they usually prescribe antibiotics too. If it gets to the open lesion stage, you need them. Treatment in the first 48 hours is always best, but it also works much later.

The worst case I’ve seen cured was a woman sharing a hospital room with my mom about 10 years ago. She had a bite on her foot and had been in the hospital for about two weeks when we met her. The lesion was about 3 inches across, and about every other day, the doctor unwrapped it and scraped the necrotic tissue out, rendering screams. He and a consulting doctor had begun to discuss amputation. We told her and her husband and two adult kids of our experiences and advised them to consult some out-of-town doctors. They found a doctor in Springfield, MO, who used cortisone to successfully treat several cases. When her then-doctor refused to listen, confer with the other one, or release her, they took her out anyway. About two months later, we got a long letter profusely thanking us for butting in. She was healed up and on her feet again, feeling we probably saved her foot and maybe more.

Other kinds of cortisone might work, but both vets preferred Dexamethasone. It is thin like water so that it can be injected through tiny insulin needles, an important matter when injecting a super tender spot three times. A tenth of a CC isn’t much – it is about 1/8th of an inch of a wooden pencil eraser, then split that in thirds per injection. That is a small fraction of a normal systemic dose given for arthritis and such, so risks are also tiny.

Visit MedlinePlus and read the precautions to know what to advise your doctor about, like pregnancy or fungal infections. By telling you this, I am not advocating self-medication. I suggest you ask your doctor how your bite will be treated. If the old approach of cutting and scraping is mentioned, offer the information on this page and ask whether cortisone treatment is appropriate in your case. We found that emergency room and after-hours clinic doctors seem more open-minded. Several friends reported their ER doctor said cortisone injection around the site was their normal treatment anyway. I’m not a doctor, and I’m not giving medical advice beyond suggesting it is acceptable to ask questions and seek a second opinion. If you have any questions, feel free to leave a comment below. – Gerald