When It Feels Like Bugs… But the Evidence Isn’t There
At The Pest Company, we deal with all sorts of critters. Bed bugs, cockroaches, fleas, ants – if it creeps and crawls, we can usually find it and fix it.
But sometimes we get calls from people who feel itching, crawling or biting sensations without any obvious insect culprit. They’ve often tried multiple sprays, stripped out carpets, called in countless companies. There are no sign of pests, but the symptoms feel very real. What’s going on?
The answer touches on a condition that doctors call delusional infestation (sometimes delusional parasitosis). DI is when someone develops a fixed belief that insects or parasites are attacking them (or their home), even though repeated examinations find no evidence of an infestation. The sensations are genuine, the distress is real, and it isn’t a sign that someone is being silly or making things up – it’s a mental health problem that is often unheard of, but deserves understanding.
What we often see
From the outside, a typical pest control call that involves delusional infestation looks exactly like any other job at first. However, we often start to see clues that make us start to consider DI is the cause. The clients report constant itching or crawling sensations, but no live insects have been found. They may link bits of lint or fluff to “eggs” or “bugs” and carefully collect these as samples as evidence of the problem. Many have immaculate homes due to relentless cleaning trying to solve the problem. In many cases we find they have been spraying insecticides relentlessly, and some have had other pest controllers round multiple times before.
Of course when you are experienced pest controller its much easier to see that the evidence the client is focusing on isn’t related to a real pest control issue. But for those suffering from DI, any evidence that hints at a possible infestation only reinforces the belief.
It also tends to show up more often in adults over 50, and women appear to be affected more than men, though people of any age or gender can experience it. Anxiety and stress are frequently part of the picture: if you’ve ever lived through a real bed‑bug outbreak you’ll know the dread can linger long after the bugs are gone.
The problem of course is proving a negative. Its hard to prove that a pest isn’t there!
Why repeated spraying can make things worse
We understand the impulse to throw every pesticide you can find at a problem. If you really have an infestation, a targeted, professional treatment plan is the right answer. But when there is no infestation, over‑treating can backfire. Many insecticides can irritate the skin or cause tingling sensations with over‑exposure—exactly the kind of feeling someone might interpret as a bite. You can end up stuck in a vicious loop: the more you spray, the more you itch, the more convinced you become that there’s still something there.
How this impacts lives
The consequences go far beyond itching and bites. We’ve seen people stop socialising, avoid having family visit, stop using their cars, rip out perfectly good furniture or flooring, or spend thousands of pounds on renovations. Relationships can suffer. Work can suffer. It can become a full‑time job chasing a pest that isn’t actually present.
To make matters worse, there are operators in our industry who will take advantage of that fear and sell unnecessary treatments.
One of the most heartbreaking situations we’ve handled involved a tenant who was absolutely sure that clothes moths were “biting” her and infesting her home. Repeated inspected found no evidence of moth activity. The client related seeds and other bits of debris she had collected as moth eggs. The sensations and situations she described didn’t match what moths do. In the end, at her request her housing association relocated her. We cautioned that unless she was able to let go of the belief, she would take the problem with her — and she did: within weeks she was calling from her new home with the same symptoms. It was tragic to watch, because her conviction that the moths were real meant she wouldn’t engage with the medical support offered by the local authority.
Our approach
In most cases pest control infestation are real. If you ring us, we absolutely will take you seriously! Any job we are called to we would investigate thoroughly to look for signs of pest. After all, if we can find an active infestation that is work for us!
Here’s what you can expect when you contact us:
- We listen and take your concerns seriously.
- We conduct a thorough inspection looking for hard evidence—live insects, eggs, droppings, and other signs.
- If we find an infestation, we explain the options clearly and recommend an effective treatment.
- If we find nothing, we’ll tell you exactly what we checked and what we didn’t see.
- We don’t offer “just in case” treatments, these do not comply with COSSH regulations.
- Low level infestations can sometimes be hard to find. We might leave traps, perform swab tests, or offer ongoing monitoring to be as sure we can be that pest are present.
- In the unlikely event we do suspect DI is a factor, we would advise to speaking to your GP to explore the possible cause. A GP or dermatologist can explore other causes, including skin conditions, underlying health issues or medication side effects.
We will look for evidence while trying to offer and a bit of human compassion. We’ve had clients who are otherwise perfectly coherent and capable people but absolutely convinced that flies or mites are attacking them. It doesn’t mean they’re irrational—it means they need support, not salesmanship.
When you should call us
If you’re noticing bites, marks on your skin, droppings, live insects or other clear signs, don’t suffer in silence. Call us, and we’ll confirm what’s there and sort it out.
If you’re feeling biting or crawling sensations but there’s no visible evidence, multiple inspections have found nothing and treatments haven’t helped, it might be time to involve a healthcare professional as well. A sensible approach could save you time, money and a lot of stress.
If you have a friend or family member who you suspect is suffering from a delusional infestation, seek support from a pest control professional, but also encourage the person to speak to their GP.
A final word
Delusional infestation is a serious condition. It’s rare overall, but it’s more common in our line of work than you might think. Our role is to separate fact from fear and to steer you toward the right solution—whether that’s a treatment plan for bed bugs or a conversation with your doctor about something else.
This article is for general awareness only and does not provide medical advice. If you’re concerned about your health or symptoms, please consult your GP or another qualified healthcare professional.
More information, visit the BPCA – Delusional Parasitosis
