Fleas vs Bed Bugs: Key Differences and Solutions Revealed

We know you’re dealing with bed bugs invading your space, potentially putting health and property at risk. If you need help identifying and eliminating the infestation at the source, connect with our recommended local professional near you.

Fleas and bed bugs are two common household pests that can cause discomfort and health problems for both humans and pets. As small insects, fleas and bed bugs survive by feeding on animal or human blood. While they share some similarities, it’s essential to understand their differences to effectively tackle and prevent infestations.

Fleas are known to predominantly infest animals, causing discomfort and itchiness. They can also transmit diseases such as flea-borne typhus, plague, or cat scratch disease (CDC). In contrast, bed bugs feed on human blood, typically while they sleep, and are characterized by their reddish-brown color and flat shape (CDC). Though a nuisance, bed bugs do not transmit diseases.

Effective pest control measures differ for fleas and bed bugs. To prevent fleas, regular cleaning of carpets, rugs, upholstery, and pet bedding is essential (CDC). In the case of bed bugs, regular inspection of mattresses, furniture, and clutter is crucial to detect early signs of infestations.

Fleas vs Bed Bugs: Understanding the Differences

Appearance and Size


  • Oval-shaped and about 2-3 mm long
  • Have long legs designed for jumping

Bed Bugs:

  • Flat, wingless insects
  • Slightly larger, ranging from 1mm to 7mm


Color and Movement

  • Fleas: reddish-brown, can jump up to 13 inches.
  • Bed Bugs: reddish-brown, but cannot jump and only crawl.

Comparison Table:

CharacteristicFleasBed Bugs
MovementCan jump up to 13 inchesCan only crawl



  • Typically found on pets, like cats and dogs
  • Also in carpets, pet bedding, and upholstered furniture

Bed Bugs:

Feeding Patterns


  • Primarily feed on blood of mammals (pets and sometimes humans)
  • May cause itching, discomfort, and even diseases

Bed Bugs:

Pros and Cons of each insect (in terms of their impact on humans):


  • Pros: None
  • Cons: Itching, discomfort, diseases

Bed Bugs:

  • Pros: Do not transmit diseases
  • Cons: Itchy bites, property loss, inconvenience

Recognizing Bed Bug Bites and Flea Bites

Location and Pattern

  • Bed bug bites:
    • Typically found on arms, legs, face, and neck.
    • Often appear in a straight line or cluster.
  • Flea bites:
    • Commonly located on lower legs and feet.
    • Tend to be random in pattern.

Example: You may find three bed bug bites in a row on your arm, whereas flea bites may be scattered randomly on your ankles and lower legs.


  • Bed bug bites:
    • Reddish-brown in color with a dark red center.
    • Mild to severe itching, possibly leading to blisters or a rash.
    • Swelling may occur around the bite area.
  • Flea bites:
    • Similar reddish-brown color but smaller in size.
    • Intense itching, often followed by a rash or hives.
    • Bites may become swollen and sore.

Antihistamines can help alleviate itching and swelling from both bed bug and flea bites as a short-term relief.

FeatureBed Bug BitesFlea Bites
LocationArms, legs, face, and neckLower legs and feet
PatternStraight line or clusterRandom
ColorReddish-brownReddish-brown (smaller)
SymptomsItching, rash, blistersItching, rash, hives, swelling
TreatmentAntihistamines (short-term)Antihistamines (short-term)
Call for pest control services now.

Complications and Allergic Reactions

Infections and Allergies

Fleas and bed bugs can cause different complications, such as skin infections and allergic reactions. For instance, flea bites can lead to flea-borne typhus and bed bug bites can cause allergic reactions.

Here’s a comparison table to understand their differences better:

FleasBed Bugs
Cause itchiness and irritationLess irritating than flea bites
Can transmit diseases like flea-borne typhusDo not transmit diseases
May lead to secondary skin infectionsRarely cause skin infections

To reduce the itchiness and discomfort of bites, you may use:

  • Calamine lotion: helps soothe the skin
  • Anti-itch cream: reduces itching and inflammation

When to Seek Medical Attention

There are times when it’s necessary to consult a doctor:

  1. Skin infection signs: redness, swelling, or pus around the bite
  2. Severe allergic reaction: hives, difficulty breathing, or dizziness

In these situations, contact your doctor for appropriate treatment and advice.

Preventing and Treating Infestations

Bed Bug Control

To prevent bed bug infestations, regularly inspect your home for signs of infestation, especially in the ribbing of mattress corners. Keep your home clean and clutter-free to reduce hiding spots. Steps to control bed bugs include:

  • Launder sheets and bedding in hot water and dry at high temperatures.
  • Vacuum your home regularly, focusing on carpets, rugs, and upholstered furniture.
  • Place mattress and box springs in bed bug-proof encasements.
  • Seal cracks and crevices in walls and baseboards.

Flea Control

Fleas often infest homes due to pets. To prevent flea infestations, consider the following steps:

  • Vacuum carpets, rugs, and cushions regularly, then empty the vacuum bag outside.
  • Wash pet bedding frequently using soap and water.
  • Treat pets with veterinarian-approved flea control products.

Sometimes, despite prevention efforts, infestations occur.

Call for pest control services now.

Professional Treatment

In some cases, professional treatment may be necessary for both bed bug and flea infestations. Pest control professionals can provide tailored solutions based on the level of infestation and the materials present in your home.

 Bed BugsFleas
Signs• Visible bugs
• Tiny black or brown bug droppings
• Small reddish stains
• Bites on pets or humans
• Black specks on bedding or carpets
Control Methods• Cleaning
• Laundering in high temperatures
• Vacuuming
• Encasements
• Vacuuming
• Washing pet bedding
• Flea control products for pets

Both bed bug and flea infestations require consistent effort to control and may need professional pest control services to fully eradicate the problem.

Keeping Pets Safe and Pest-Free

Pet-Specific Treatments

When it comes to protecting pets like cats and dogs from fleas and bed bugs, there are specific treatments available. For example:

  • Flea preventatives: Flea medication to deter fleas from biting pets.
  • Flea comb: Gently remove fleas from pets’ fur with a flea comb.

It’s important to consult with a veterinarian for proper guidance on using these treatments.

Flea preventativesProtects petsNeeds veterinarian guidance
Flea combGentle, non-invasiveTime-consuming, only addresses adult fleas

Protecting Your Pet’s Environment

Creating a pest-free environment for pets and humans is a long-term solution. Here are some quick tips:

  • Vacuum often: Clean carpets, rugs, and cushions to remove fleas and their eggs.
  • Clean bedding: Wash pet and human bedding regularly with soap and water.
  • Outdoor areas: Ensure your yard is clean, tidy, and free from debris.

Keep in mind, both fleas and bed bugs can impact the comfort and health of pets and humans. Taking steps to maintain a clean and pest-free environment will help keep everyone safe and itch-free.

Diseases and Health Concerns Associated with Fleas and Bed Bugs

Diseases Transmitted by Fleas

Fleas are tiny insects that feed on blood and can transmit various diseases to humans and animals. Here are some common diseases associated with flea bites:

  • Flea-borne typhus: This disease is transmitted to humans by infected cat fleas or Oriental rat fleas and their feces (source). Commonly reported in California, Texas, and Hawaii.
  • Plague: Fleas can also transmit the Yersinia pestis bacterium, causing the plague, a potentially fatal infection.
  • Cat scratch disease (CSD): Usually caused by bites or scratches from infected cats, but fleas can also carry the bacteria responsible for CSD (source).

Comparison Table

Flea-borne typhusFever, headache, joint/muscle painAntibiotics
PlagueFever, weakness, swollen lymph nodesAntibiotics
Cat scratch diseaseFever, swollen lymph nodes, fatigueAntibiotics, if needed

Health Risks from Bed Bugs

Although bed bugs feed on human blood, they do not transmit diseases like fleas. Their bites cause itchiness and discomfort and may lead to secondary infections if scratched.

However, bed bug infestations can have negative effects on mental health, causing stress, anxiety, and sleep disturbances.

Bite Characteristics:

  • Reddish, swollen bumps
  • Itchiness and inflammation around the bite
  • Clustered or linear patterns

Infestation Signs:

  • Tiny dark spots on beddings
  • Molten skins from nymphs
  • Fecal spots on mattresses and nearby areas

In conclusion, both fleas and bed bugs cause problems for humans, but fleas are linked to more serious diseases. Recognizing the signs of infestations and bites is important for proper prevention and treatment.

Reader Emails

Over the years, our website, whatsthatbug.com has received hundreds of letters and some interesting images asking us about these insects. Scroll down to have a look at some of them.

Letter 1 – Fleas

Subject: What’s this bug?
Location: Houston TX
April 18, 2016 8:11 am
Found in my bathtub jumping around after a large rain storm. There were quite a few in there, it’s the only place in the house I have seen them.
Signature: Harris


Dear Harris,
You have Fleas.

Update:  It is quite possible there are many more Fleas present than you have seen, and only when they jumped into the bathtub and couldn’t jump out that you noticed them.

Letter 2 – Flea

Subject: What type of bug is it?
Location: Sunnyvale california
February 18, 2015 12:29 am
Hi bugman,
I recently moved into an apartment in California. Over the last 5 days I have seen 5 of these bugs. 2 on my bathroom floor, 1 in my bathtub, and 2 in my bed.
I’m hoping it’s just springtails and not fleas, but I was hoping you could confirm that for me. When I get close to these bugs they jump 3-4 inches off the ground to a different location, and when I squish them it looks like blood comes out.
I don’t have any pets, no itchy red bumps, I’m a pretty clean person overall.
Let me know what you think.
Signature: Jordan


Dear Jordan,
The laterally compressed body and the jumping you describe both indicate that this is a Flea.  Perhaps the previous tenant had pets.

Letter 3 – Flea

Subject: Flea or something similar
Location: Washington state
August 9, 2015 11:47 am
hello. Over the course of the last week we have noticed something both in our house and outside. I first realized I had some small itchy bites around my ankles. I then saw a bug up in my bathroom. I was able to catch it and kill it. I tried to squish it under toilet paper with my nail, took a photo and noticed it was still wiggling. I continued to try and squish it and it took a long time. We have since noticed more bugs and bites. We live in Washington state and have an outdoor deck and live next to a small storm water retention pond (but it is dry this time of year). We first found them inside and just yesterday went to sit on our deck on a outdoor couch and noticed a swarm of the bugs on our ankles and legs. Both my husband and I have bites and we found one in our baby’s hair this morning. We did have raccoons under our deck a month ago, but they were driven out by coyote scent that was planted. They are now gone.
The bug…it looks like a flea, see pics.
Looking forward to your response.
Signature: Bugs of Wa


This is definitely a Flea and it might be connected to the raccoons you had under the deck.

Letter 4 – Flea

Subject:  What is this Jumping/Flying big
Geographic location of the bug:  My Bed
Your letter to the bugman —
I am getting itchy red bites all over my body. Legs, thigh, stomach, Arms, Hands, lower back. I found small jumping or flying bugs. They are tiny and look like a spec of dirt. Is this a flea or a bedbug or something else?
How you want your letter signed —


Dear Adriana,
Between your description and the blurry image you submitted, we are quite certain you are getting bitten by Fleas.  Do you have a pet that sleeps on the bed with you?  You should consider flea treatment for your pet.

Letter 5 – Flea we believe

Subject: bug!?
Location: calgary, Alberta, Canada
February 2, 2014 11:35 pm
Hi, a few weeks ago I had three itchy spots on my hip, a week after I had an itchy bite in between my fingers. Tonight I am laying in bed and feel a tickle on my finger, sure enough there is a big crawling on me. I moved it to my end table and snapped a few pictures. It moved quickly, was only about 3 to 4 mm. It did not appear to have wings, have a pointed back (not flat). It then jumped(?) or possibly fell off my side table and I have not found it since.
I live in Calgary, Alberta, Canada, it is currently January and pretty cold outside (-15ish). I have checked my mattress and haven’t found any other bugs.
Signature: kelly


Hi Kelly,
Do you have a pet dog or cat?  Your photo is blurry, but this looks suspiciously like a Flea to us.  The size and behavior you described would support our identification.


I have a cat and a dog. I have checked them both neither have fleas.
What is the livelihood I have one lone flea hanging around my house that keeps biting me?

We can’t really speculate on the likelihood of a single Flea, but your photos do look like a Flea.  See BugGuide for additional images.

Letter 6 – Flea in North Ireland

Subject: Ate Alive
Location: Northern Ireland
April 19, 2015 4:04 pm
Hi I’ve been getting ate alive for the past month. Only me not my partner. I’ve tried hoovering my house from top to bottom I’ve tried endless amounts of flea spray but I’m still finding these bugs just walking up my arm/legs and biting me. When I squeeze them to kill them they just keep walking you have to squeeze then about 4 times to kill them . They don’t even go on my boyfriend just me. Please help me get rid off these.
Signature: Thanks Christine


Dear Christine,
This is definitely a Flea, and we suspect perhaps you have a pet that goes outdoors and that might be the source of your indoor infestation.  We do not provide extermination advice, but now that you know what you have, we imagine you will be able to find online sources that provide suggestions for your problem.

Thankyou for your help. We have flea sprayed the house 3 times from top to bottom and it hasn’t help. Today I’ve just found 3 on the outside bathroom window (upstairs) so they must be getting in the window As we don’t have any pets, we have contacted pest control and they are going to come help us. Thanks again Christine.


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. whatsthatbug.com is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

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  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

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2 thoughts on “Fleas vs Bed Bugs: Key Differences and Solutions Revealed”

  1. The bites on your feet and ankles is a pretty good clue that it’s fleas you’re dealing with. You’ll need to apply something to kill the fleas in your carpet/flooring, and then steam clean it to get the eggs. Treat your pets if you have any. Fleas are tough to deal with but not as bad as lice or bedbugs. Good luck!

  2. Just FYI. The best way to kill the miniture blood-sucking vampires called “fleas” is by NOT trying to squeeze the little blood demons but rather to “roll em” while they eat! Now I consider myself a pretty strong fella, as I work out on a regular basis, but squeezing as hard as I could for as long as humanly possible did not kill the last one I tried to expire by this method. Now I just roll them like puddy or dough (like masa for making tortillas for all you Mexican folk out there ) and voila… DEAD flea! Try it, you’ll like it..

    Hope thIs helps someone, anyone in desperate need of help and good luck hunting to ya all.

    Signed: “El flea hatin’ MexiCAN from California”!


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