Understanding Lump Formation in Chickens: What You Need to Know

Chickens are fascinating creatures, and sometimes they can leave us scratching our heads in bewilderment. From sudden changes in behavior to unusual nesting habits, these backyard companions can be quite a mystery. One perplexing situation that may arise is when your chicken develops a lump on its chest. If you’re reading this article in a state of panic, wondering if your chicken has a tumor or swallowed something alarming, take a deep breath. In many cases, a lump on your chicken’s chest is nothing more than a temporary issue that can be easily resolved at home.

What Causes a Lump on a Chicken’s Chest?

There are various factors that can contribute to the formation of a lump on a chicken’s chest, with some being more common than others. Let’s explore the two main possibilities:

Possible Cause #1: Impacted or Sour Crop

One of the most common reasons for a lump on a chicken’s chest is an impacted or sour crop. The crop is a vital part of a chicken’s digestive system, situated just beneath the neck against the breast area. After a chicken consumes food, it passes through the crop as the first stop in the digestive process. Normally, the crop should be filled during the day and empty by morning.

However, when food remains in the crop for too long, issues can arise. This can lead to yeast production, which can cause illness and infection. You may suspect an impacted or sour crop if you feel a lump and notice an unpleasant smell in this area. Signs of a sour crop include watery and squishy feelings accompanied by diarrhea, while an impacted crop feels swollen and hard.

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Possible Cause #2: Breast Blister

Another common cause of a lump on a chicken’s chest is a breast blister, also known as a keel cyst or sternal bursitis. This condition occurs due to inflammation in the chicken’s keel bone. It is more prevalent in injured or sick chickens that spend a significant amount of time lying with their weight pressing against the breast bone. Meat birds or broilers that are unable to stand due to obesity or rapid weight gain are particularly susceptible to breast blisters. The severity of the lump can range from mild to severe and may result in feather loss, inflammation, and fluid-filled blisters.

How to Treat a Lump on a Chicken’s Chest

Treatment options depend on the specific cause of the lump. Here are some strategies you can try:

Do Nothing

In many cases, a sour or impacted crop will resolve itself without intervention. However, severe cases can cause discomfort and potentially lead to death. If the crop remains hard after a day or two, further steps must be taken to resolve the issue.

Treat Wounds

If the lump is a breast blister, it’s necessary to address the underlying wound. Clean the wound and use a mild antiseptic. Applying a wound dressing spray, such as Blu Kote, can aid in healing. During this time, you might need to isolate the affected chicken from the flock to prevent aggression towards the injured bird.

Use Antibiotics

If a breast blister is causing the lump and the skin is broken, antibiotics may be necessary to prevent secondary infections. To prevent future blisters, provide your chickens with soft surfaces to rest on and ensure prompt replacement of damp bedding materials.

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Withhold Feed

For an impacted crop, you can withhold feed (but not water) for a couple of days. This can enable the crop to empty and relieve any blockage. If the food comes out of the chicken looking nearly identical to when it was consumed, further steps should be taken.

Olive Oil or Apple Cider Vinegar

Adding apple cider vinegar to your chicken’s water can help clear up a sour crop and dislodge impactions. Use one to two teaspoons of apple cider vinegar per cup of water. However, avoid using galvanized metal containers when adding apple cider vinegar, as it can cause harm to your chickens. Olive oil can also be used to lubricate blockages, although it lacks the probiotics and nutrients present in apple cider vinegar.


Gently massaging the chicken’s chest can help loosen impactions within the crop. This should only be attempted for an impacted crop and not in cases involving breast blisters or other issues. Massage the chest a few times a day for several minutes until you feel the blockage start to dissipate.

Preventing Chicken Chest Lumps in the Future

Taking preventive measures can minimize the occurrence of chest lumps in your flock. Consider the following steps:

Consider Breed

While sour and impacted crops can affect any chicken breed, breast blisters are more common in fast-growing meat or broiler chickens, such as Cornish Cross birds. If lumpy chests become a recurring issue, you might want to consider raising a slower-growing breed.

Consider Feed

Providing chickens with access to fresh water and high-quality feed during their waking hours can improve crop health. Include a variety of greens, vegetables, and fruits in their diet to increase fiber and digestive enzyme intake. If your chickens are confined, offer store-bought grit to aid in grinding up their feed. However, chickens raised on pasture usually obtain enough grit naturally.

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Avoid Antibiotics

Overuse of oral antibiotics can disrupt the digestive process by killing beneficial bacteria. If antibiotics are necessary, supplement with probiotics to replenish the good bacteria. Probiotic powders, liquid supplements like Rooster Booster, or live culture yogurt can fulfill this role. Additionally, limit overly sugary feed options to prevent yeast overgrowth.

Prevent Parasites and Diseases

Parasites, both internal and external, can lead to malaise and contribute to the development of chest lumps. Maintain good flock hygiene, provide clean water, and offer nutritious feed to minimize the risk of infestations. Utilize natural dewormers like apple cider vinegar and garlic for internal parasites. Promptly treat signs of illness to prevent sour or impacted crops.

Treating Chicken Chest Lumps – My Experience

In my own experience, the lump on my chicken’s chest resolved itself within a day or two, likely due to a mildly enlarged crop. However, if the issue persists, consider implementing the solutions mentioned above to determine the best course of action for your flock. Remember, if you are unable to diagnose the problem, it is always wise to consult a veterinarian who can provide expert guidance. Best of luck with your chickens!

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