Why Do Spiders Bite? Shocking Facts About Spider Bite

Why do spiders bite, and how harmful is their bite? There are billions of them, and most are innocent and scared of getting close to human habitat, but a few others can bite or sting you and cause real trouble.

In one of our articles, The Most Dangerous Spider in the World, we listed the top 10 most poisonous spiders you should avoid and possible ways to deal with their bites.

Read this article to discover why these arachnids bite.


Things To Note About Some Spider Bites

Why Do Spiders Bite
Picture of a Spider Bite On the Neck

Firstly, you must remain calm. Human skin is generally too thick for most spiders to penetrate, but some spiders can inject venom through their bites.

A spider’s bite usually appears as two dots in a circle, but three types of spiders can be found in homes.

It’s best to avoid the Black Widow, Tarantula, and Brown Recluse spiders, as their bites can cause intense pain for up to one and a half hours. Symptoms may include dizziness, shivering, and difficulty breathing.

Brown recluse spiders are commonly found in the Midwest and southern regions of the central United States. They tend to inhabit houses, barns, and lofts and can often hide behind furniture or floorboards.

These spiders have a distinctive violin-shaped mark on their bodies, although it may be difficult to see at times.

On the other hand, the Black Widow spider can be found throughout the entire country and typically lives outdoors in protected areas such as heaps of stone or firewood. This species also has a red or orange hourglass mark on its belly.

Tarantula bites are not venomous, but if you intentionally disturb them, they may release needle-like hairs that could cause an allergic reaction. It’s best to avoid interacting with tarantulas.


Read also: Sac Spider Bite: Description, Signs & Treatment


Why Do Spiders Bite?

Most insects are capable of biting people, but when it comes to spiders, some species are more aggressive than others.

Nevertheless, spiders only bite when they feel threatened, provoked, or when their habitat is being invaded and destroyed.

Therefore, if you come across a spider or its habitat, make sure there are no spiders around, as some spider bites can be poisonous and even fatal.


What to do When Spiders Bite

Now, if a spider bites you, try to do the following in the absence of a medical expert:

  • Put a tourniquet on the damaged arm.
  • Cut the wound by yourself, trying to get rid of the poison, and wash the bite area with soap.
  • Put ice on it and take a painkiller if necessary.
  • Drink a lot of water.
  • If the bite is on the arm or leg, go to bed and put it down to stop the spreading of the poison and prevent an allergic reaction.
  • You might need to take an antihistamine.
  • Anyway, if it starts swelling or you feel pain, call the doctor immediately.


Read also: Does the Dock Spider Bite?


What are the Allergic Reactions to Spider Bites?

The allergies to spider bites differ depending on the immune system of the individual chomped. People with a stronger immune system seem to show little or no allergies. Below are the different allergic reactions to spider bites:

  • Prints all over the body, even underclothes.
  • Rash areas merge with each other and don’t have a particular shape.
  • They can change their look very quickly, and histamines help to relieve the symptoms of an allergy.
  • Some people have an allergy to spider bites because the body reacts to blood thinners and their saliva and tries to destroy them.
  • Intense itching and swelling around the bite area.
  • A runny nose and itchy, watery eyes.


What are the Allergic Reactions to Spider Bites In Animals?

A strong allergic reaction in animals is itching and pain. When a bug bites through the skin trying to feel suitable capillaries, sometimes it is difficult to tell a spider’s bite from allergic dermatitis.

Bites look like a gathering of microskin injuries in the same area.

Usually, their bites make up a line on sensitive skin; the line can turn into a single red, swollen spot, and it can be difficult to see the exact places where the skin was pierced.

Good hygiene is a spider’s main enemy. So first of all, you will need to wash the bitten spots with soap, and you will also need an anti-inflammatory medicine or an antihistamine.


Read also: Do Jumping Spiders Bite?


What are the Illnesses and Diseases Caused By Spider Bites?

Having known why spiders bite, there are various illnesses and diseases caused by these bites. In some individuals, the human body reacts to a spider attack with a red spot in place of a bite.

Diseases caused by spider bites are more like Elytis or Lyme disease; other bites carry about 80% to 90% of any viruses or bacteria, but there can be an allergic reaction to the spider’s bite.



Depending on the part of the body where the bite occurs, the damage could be minor. If it’s on a leg, arm, or back, the skin may turn red, swell, or small, thick blood may appear.

You’ll feel a stinging pain and a burning sensation. Then, the area around the bite will turn white, and you may experience a pins-and-needles sensation.

This happens because of the spider’s poison, apitoxin. Around 15 to 20 minutes after the bite, you’ll feel an intense itching sensation at the site of the sting.

Self-puncture appears as a small, reddish wound that can last from 1 to 20 hours and gradually reduces with time.

The intensity of swelling can vary among different species and may even cause complete swelling that lasts from 36 hours to eight days.

Why do spiders bite? Well, now you know!

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