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You can tell if your chicken has worms by checking for weight loss, pale egg yolks, diarrhea, and respiratory gasping. However, the only 100% accurate method is a veterinary fecal float test. Here are the exact clinical signs to look for in your flock. What You Need to Know Internal parasites (worms) are an almost unavoidable part of keeping backyard chickens. They pick up worm eggs from the soil, insects, or wild bird droppings. The Simple Analogy: Think of worms as microscopic thieves living inside your chicken’s digestive tract or lungs. They are stealing the nutrients your hen needs to lay eggs, stay warm, and fight off diseases. The biggest mistake flock owners make is waiting for obvious symptoms. By the time a chicken looks visibly sick, the “thieves” have already multiplied into a massive burden. As a veterinarian, I always tell my clients: Do not guess; test. But knowing the clinical signs will tell you exactly when it is time to call the lab. The 5 Clear Signs Your Chicken Has Worms 1. Weight Loss Despite a Good Appetite (The “Free-Loader” Effect) If your hen is eating enthusiastically but her body feels bony, her breastbone is sharp, or she is losing weight, worms are the prime suspect. 2. A Drop in Egg Production and Pale Yolks When a chicken’s body is under attack by parasites, it goes into survival mode. It stops diverting energy to the reproductive system (laying eggs) and focuses entirely on staying alive. 3. Respiratory Distress and “The Gape” This is the hallmark sign of a very specific, dangerous parasite: the Gapeworm (Syngamus trachea). Unlike intestinal worms, gapeworms live in the chicken’s trachea (windpipe). 4. Changes in Droppings (Diarrhea or Bloody Poop) While normal chicken poop varies in color based on diet, worm infections can cause distinct changes. 5. Pale Comb and Wattles (Anemia) If your hen’s normally bright red comb and wattles look pink, pale, or almost white, she is anemic. Clinical Insight: The Veterinarian’s Perspective From the Merck Veterinary Manual:“Diagnosis of nematode (roundworm) infections in poultry is confirmed by identifying eggs in the feces via flotation techniques. However, clinical signs of parasitism (weight loss, diarrhea, decreased egg production) typically only manifest when the worm burden is high. Gapeworms (Syngamus trachea) cause severe respiratory distress (‘gaping’) and can be fatal. Treatment requires specific anthelmintics, but drug resistance is an increasing concern in poultry, making targeted treatment based on fecal egg counts essential.” From Blackwell’s Five-Minute Veterinary Consult (Avian) & Diseases of Poultry:“When evaluating a flock for internal parasitism, the clinician must emphasize that visual inspection of feces for adult worms is highly unreliable, as most poultry nematodes are small and shed eggs microscopically. A quantitative fecal egg count (FEC) is the gold standard for determining the need for anthelmintic therapy. Blind or routine deworming without diagnostic confirmation accelerates anthelmintic resistance.” Actionable Takeaways: What to Do Right Now Step 1: Get a Fecal Float Test (The Gold Standard) You cannot treat what you haven’t diagnosed. Collect fresh droppings from your flock (mix a few samples from different birds) in a ziplock bag. Keep it cool and take it to your veterinarian. They will perform a fecal flotation test, which separates the microscopic worm eggs from the fecal matter so they can be seen under a microscope. This tells you exactly which worm you have and how many. Step 2: Listen for “The Gape” Walk into your run early in the morning when it is quiet. Listen closely to your flock. If you hear any clicking, wheezing, or see a bird stretching its neck to gasp, isolate that bird immediately. Gapeworms are highly contagious and require specific, targeted treatment (like ivermectin or fenbendazole) prescribed by your vet. Step 3: Implement Pasture and Coop Management Worm eggs thrive in warm, moist, shady environments. Step 4: Use Targeted Dewormers Once your vet confirms the type of worm, they will prescribe the correct anthelmintic (dewormer). Samiversity FAQ: Your Worm Questions Answered Q: Can I see worms in my chicken’s poop? A: Rarely. The most common intestinal worms (like roundworms and cecal worms) are very small, and the chicken sheds microscopic eggs in the feces, not the adult worms. You would need a microscope to see them. The only time you might see adult worms in the poop is if the bird has a massive, severe infestation, or after you have successfully administered a dewormer. Q: Can humans get worms from chickens? A: The common intestinal worms that affect chickens (roundworms, gapeworms, cecal worms) are species-specific and do not infect humans. However, chickens can carry bacteria like Salmonella and Campylobacter on their feathers and feet, which can transfer to your hands. Always wash your hands thoroughly with soap and water after handling your flock or cleaning the coop. Q: How often should I deworm my flock? A: You should not deworm on a blind schedule (like every 3 months). Routine, unnecessary deworming is the primary cause of parasite resistance. Instead, perform a fecal test in the spring and fall. Only deworm if the test shows a high worm egg count. If your coop is kept very clean, dry, and your birds are not overcrowded, they may never need chemical dewormers. Q: Are the eggs safe to eat if my chicken has worms? A: Yes, the worms themselves do not pass into the eggs, so the eggs are safe to eat. However, if you treat your chickens with a deworming medication, you must follow the medication’s “egg withdrawal” period. Depending on the drug and whether it is approved for laying hens, you may need to throw away the eggs for 7 to 14 days after treatment. Always consult your vet for the exact withdrawal time. Veterinary References This article is grounded in established veterinary parasitology and poultry medicine. For further reading, consult: The Bottom Line: Test, Don’t Guess Internal parasites are a natural part of the chicken-keeping environment, but they don’t have to compromise your flock’s health. The biggest takeaway from