Spider bites factsheet

Introduction

Australia is home to many types of spiders, some of which are venomous. Venom is a poison that enters the bloodstream through bites or stings. 

Venomous spiders have long, sharp fangs, which they use to bite. Some spiders are too small for their fangs to pierce human skin, and others have venom that only affects small animals, not humans.

In Australia, some common types of spiders have venom that is dangerous to humans.

Funnel-web spiders

Funnel-web spiders are:

  • black or dark brown 
  • shiny or glossy
  • around 1.5-3.5 cm long.

They make burrows and hide in and around places like:

  • logs
  • rocks
  • dense garden shrubs
  • holes and rotted parts of some trees.

Funnel-web spiders can move very quickly. When threatened, they rear up on their back legs, lunge, and bite with their fangs. They are often confused with other black spiders, like mouse spiders.

Mouse spiders

Mouse spiders are:

  • plump
  • black, black with a light grey or white patch on top, or dark blue 
  • shiny or glossy
  • around 1.5-3.5 cm long.

Mouse spiders are less common. They live in burrows, often near:

  • riverbanks
  • creeks
  • gardens.

Like funnel-web spiders, mouse spiders move quickly and will rear up and bite if they feel threatened. They are also sometimes confused with funnel-web spiders.

Redback spiders

Redback spiders:

  • are black or dark brown with a red stripe on their body
  • have long, thin legs
  • have round bodies and smaller heads
  • are around 1 cm long for females and 3-4 mm for males.

Redback spiders are common in places where humans live. They build webs in dry, sheltered areas like:

  • rocks
  • logs
  • rubbish piles
  • bushes
  • sheds
  • toilets.

They are most likely to bite if their web is disturbed.

聽Signs and symptoms

Symptoms of a spider bite will look different depending on the type of spider.

It is difficult to tell what kind of spider has bitten a child. Any bite from a big, black-coloured spider should be treated as a medical emergency.

Do not wait for symptoms of a spider bite to show up. Call the Poisons Information Centre on 13 11 26 for help.

Call an ambulance on triple zero (000) if your child has collapsed or is having trouble breathing.

General spider bite symptoms include:

  • sharp pain
  • nausea and vomiting
  • abdominal pain
  • swelling and redness.

Funnel-web and mouse spiders

Symptoms include:

  • severe pain
  • sweating
  • nausea and vomiting
  • drooling
  • headache
  • watery eyes
  • difficulty breathing
  • confusion and anxiety
  • numbness
  • tingling and twitching in the mouth
  • tongue and muscle spasms.

Redback spiders

Symptoms include:

  • severe pain that can spread away from the bite
  • redness and swelling 
  • headaches
  • nausea and vomiting
  • sweating
  • muscle aches
  • tiredness
  • weakness.

These symptoms can be delayed and may last for several days.

Other spiders

Other spider bites, including white-tail spiders, usually cause mild symptoms around the bite, such as:

  • mild or sharp pain
  • burning
  • redness
  • swelling
  • blistering.

Anaphylaxis and spider bites

Some children may have a severe allergic reaction, called anaphylaxis, to spider bites. Symptoms can include: 

  • wheezing, difficult, or noisy breathing 
  • swelling of the tongue
  • swelling or tightness in the throat
  • a persistent cough
  • difficulty talking or a hoarse voice
  • dizziness
  • becoming pale and floppy in young children
  • collapsing.

Children at risk of anaphylaxis may also vomit.

If your child has signs of anaphylaxis, you should:

  • follow your child鈥檚 ASCIA action plan for anaphylaxis if you have one
  • use an EpiPen庐 or Anapen庐, if there is one available
  • call Triple Zero (000) for an ambulance.

Diagnosis

If your child is bitten by a funnel-web or another large, black spider, they will need hospital treatment, as these bites can be life-threatening. 

Bites from redback or other spiders can usually be treated at home with first aid.

Speak to the NSW Poisons Information Centre on 13 11 26 or your local doctor for more information.

Treatment

Bites from funnel-web or other big, black-coloured spiders are a medical emergency.

If your child is bitten by a big, black-coloured spider, you will need to:

  • call Triple Zero (000) for an ambulance, even if you are out of phone reception
  • travel to the nearest emergency department if you cannot call
  • give cardiopulmonary resuscitation (CPR) if they collapse or stop breathing.

First aid for funnel-webs and other big, black-coloured spiders

To give first aid for a bite from a funnel-web or other big, black-coloured spider:

  1. remove your child from danger
  2. call triple zero (000) for an ambulance and follow any instructions given over the phone
  3. wrap the bite and limb in a pressure bandage
  4. keep your child as still as possible until the ambulance arrives.
  5. Watch to make sure your child does not lose consciousness or stop breathing.

Pressure bandaging prevents the venom from travelling further into the body. The bandages should be wrapped firmly but not so tight that your child feels numb or that their skin changes colour.

To apply a pressure bandage:

  1. wrap a firm, wide elastic bandage over the bite
  2. wrap a firm, wide elastic bandage over the entire limb 鈥� fingers to shoulder, toes to hip
  3. use a splint or another hard object to keep the limb straight.

If you do not have an elastic bandage, you can use:

  • clothing
  • towels
  • socks or stockings.

First aid for red-back and other spider bites

For bites from red-backs and other spiders:

  1. wash the bite with soap and water.
  2. apply antiseptic cream if available.
  3. use an ice pack or cool water to reduce swelling and pain 鈥� do not use ice on the eyes
  4. use pain relief, like paracetamol or ibuprofen, if needed.
  5. monitor for worsening symptoms or infection.

If pain and symptoms get worse, or your child develops an infection:

  • call the poisons information centre on 13 11 26 for advice and support
  • speak to your local doctor as soon as possible.

Treatment in hospital

Your child will be monitored for symptoms in the hospital. Anti-venom may be used for funnel-web bites to prevent the venom from causing further harm.

Anti-venom is a special medication that can be injected into the bloodstream. Anti-venom treats funnel-web spider bites by stopping the venom from working.

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Preventing spider bites

One of the best ways to prevent spider bites is to teach your child to leave spiders alone. Spiders usually bite to protect themselves, so bites often happen when a spider is accidentally touched or picked up.

If your child sees a spider, they should:

  • stay calm
    • move away slowly
    • tell an adult right away.

To keep your child safe from spiders, you can:

  • avoid disturbing areas where funnel-web or mouse spiders live, like rocks and logs
  • have your child wear gloves when gardening or digging
  • dress your child in closed shoes, long sleeves, and pants for activities like bushwalking
  • be cautious after heavy rain, as it can flush funnel-web spiders out of their homes
  • avoid touching spiders in water, even if they look dead, as they can survive for hours
  • take care when cleaning outdoor areas, including pool skimmer boxes
  • watch for spider webs around outdoor furniture or sheds.

Insect repellent and spiders

Insect repellent can help keep spiders away but won鈥檛 protect your child if they鈥檙e bitten.

Children over 12 months can safely use small amounts of insect repellent. Repellents containing up to 10% DEET are safe for kids. Always ask your doctor or pharmacist if you are not sure which repellent to use.

Tips for using insect repellent safely:

  • avoid applying it to the eyes, mouth, or broken skin
  • spray it on your child鈥檚 clothing rather than directly on their skin, especially for younger children
  • reapply it after swimming, sweating, or exercising.

Resources and more information

Disclaimer

This factsheet is provided for general information only. It does not constitute health advice and should not be used to diagnose or treat any health condition.

Please consult with your doctor or other health professional to make sure this information is right for you and/or your child.

The Sydney Children鈥檚 Hospitals 星空体育 does not accept responsibility for inaccuracies or omissions, the interpretation of the information, or for success or appropriateness of any treatment described in the factsheet.

漏 Sydney Children鈥檚 Hospitals 星空体育 2025


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