If you have chickens, you may have noticed that some eggs are unlike the others. Continue reading for a list of the most common chicken egg problems, if they are safe to eat, what to do about them, and more. 

Blood on the Eggshell

The sight of an egg with blood on it is pretty shocking and alarming. There are a variety of reasons for this to happen. One common reason is when a young hen first starts laying eggs. During this process young hens sometimes have blood vessels in their vent area that burst. 

Other reasons can be wear and tear, older hens aging, prolapse, or mites. A much rarer cause is bullying.

White Banded Eggs

This happens when there are two eggs in a chicken's oviduct. This causes them to make contact with each other in the shell gland pouch. When the hen forms the first egg's shell, the normal calcification process is interrupted. This causes the egg to get an extra layer of calcium. This appears as the white band around the egg. These eggs are safe to eat. 

Causes of white-banded eggs can include something simple like flock stress, or something as serious as infection. 

Body Checked Egg

These eggs look like they have grooves on the surface. These are referred to as “checks”.  They're usually at the end of the egg, especially the pointed end. The percentage of body-checked eggs increases with the age of the flocks. These eggs look like this because a hen attempted to repair any damage while the egg was in the shell gland. 

Reasons for body-checked eggs include aging hens, incorrect lighting, crowding, or disease. 

Misshaped/Odd-Shaped Eggs

Younger chickens have immature shell glands, which can cause an odd shell shape. Most times, this is not anything to be concerned about. 

Older chickens, odd-shaped eggs can result from stress. If it is a regular occurrence it could be a defective shell gland. Additional reasons include infectious bronchitis or egg drop syndrome. 

Broken and Mended Eggs

This happens when the eggshell cracks during the calcification process and repairs itself before being laid. This results in the egg appearing like a covered crack in the shell. 

Reasons for this type of egg include fright or stress during the time the hen is making the egg or the age of the hen. 

Calcium Deposits

These eggs appear with white, irregular-shaped spots all over them. They also are raised and bumpy to the touch. There are a few reasons for this including stress during the calcification process, too much calcium in a hen's diet, or defective/immature shell glands. 

Lack of Pigment/Uneven Pigmentation

There are a few factors that may affect this. These factors include diet, stress, region, illness/parasites, and age. 

Deficiencies in nutrients like protein, minerals, etc, influence the color and formation of the shell. Other nutrients like Zinc, Copper, and Manganese are also important in an egg shell's pigment. 

Speckled Eggs

These eggs are very normal. The speckles are extra calcium deposits, which form when the process of calcification is disturbed. Additionally, it could be a defective shell gland. Speckled eggs can also occur because of an excess of calcium. 

Shell-less Eggs

These eggs are a very strange sight. However, they are not what you might think. By their name, it sounds like they are just a mess of white and yolk in the nesting material. But actually, eggs without a shell are often intact. It may even look like a normal egg until you touch it! 

Chickens need a lot of calcium to create solid chicken shells. Most incidences of eggs without shells are related to a lack of calcium in a chicken's diet. 

There are a few reasons for these eggs. The first being young hens who are still adjusting and getting used to laying eggs. Another cause for shell-less eggs is disturbances at night while they are sleeping. This can upset their systems and cause the eggs they lay to not have shells. If that is the cause, some of the other hens in the flock may have bands or checks on their eggs. The egg problems should go away when the disturbances cease. 

Another possibility is the amount of salt in their diet. Too much of this can cause a thin eggshell or an egg without a shell at all. 

Infectious Bronchitis can also cause eggs with thin shells or no shells at all. Other illnesses such as egg drop syndrome can cause the same thing. 

Calcium Coated Eggs

These eggs appear white and powdery. Sometimes the egg can have a pinkish color. 

A common reason for calcium-coated eggs is when an egg stays in the shell gland for too long. 

Young hens that are experiencing stress in some way are susceptible to this when they are ready to lay because they will hold on to the egg. This type of egg is usually nothing to worry about. 

Slab Sided or Flat-Sided Eggs

This happens when two eggs are in the shell gland pouch shortly after another. This interrupts the normal calcification process. Therefore, the second egg is not as complete as the first. This may cause the egg to be flattened at the side where the eggs made contact. 

Causes for this include disease, like infection bronchitis, stress, frights, disturbances, overcrowding, a sudden large increase in daylight hours (supplementing light during winter months).

Corrugated Shell

This happens when the egg membrane is thinner than it should be. This is often a result of double ovulation (2 yolks). This causes the egg to stretch thinner to cover the extra egg contents. This means that the egg does not plump as it should. This leaves a corrugated membrane onto which the shell gets deposited, leaving the egg to take on a corrugated appearance. 

Causes of corrugated shells include extra-large egg size (often double/multi yolk eggs), New Castle disease, excessive use of antibiotics, copper deficiency in the hen's diet, excess calcium consumption, a defective shell gland, it is often seen with hens recovering from infectious bronchitis. It can be hereditary. 

Wrinkled Eggs

These eggshells have thinly crease/wrinkled surfaces. The wrinkles can range in severity from a single small wrinkle to a few large wrinkles. This is very common in older layers. As hens age, the whites in their eggs naturally get thinner. Since it is more difficult for the shell to encase a watery substance the shell can end up with bumps and ridges. 

Causes of wrinkled eggs include stress, disturbance during the calcification process, diseases like infectious bronchitis, defective shell glands, heat stress, or poor nutrition. Wrinkled eggs can also be a precursor to a lash egg. 

Wrinkled eggs are okay to eat. 

Soft Shell Eggs

Soft Shell eggs are laid with an incomplete shell. Sometimes, they only have a thin layer of calcium. Causes for these types of eggs are similar to shell-less eggs, including immature shell glands, nutritional deficiencies such as vitamins and calcium, and certain diseases/parasites, exposure to high temperatures, extreme humidity levels, stress, or disturbances. 

Soft shell eggs can be prevented by providing your chickens with oyster shells. However, you shouldn't mix it in with the feed. That way hens can choose as many as they need. 

Mottled Egg Shells

These eggs look as if there are translucent parts of the eggshell. Sometimes a glassy appearance. Mottled egg shells are sometimes thin and fragile. Causes include high humidity in the coop, some diseases, nutrient deficiencies, and overcrowding in the coop. 

Holes in Egg Shells

Pinholes or small holes in eggshells can be the result of how a chicken is laying on the eggshell. Possible causes include age, nutrient deficiency, damage from toenails, or sharp objects in the nest boxes. Most commonly, pinholes are caused by a chicken's toenails. A less common cause is birds pecking at eggs. 

Yolk-less Eggs

Although this is a rare occurrence, it is not uncommon. This happens when reproductive tissue ends up in a chicken's oviduct. Yolk-less eggs can be laid by newly matured chickens, meaning their reproductive systems are not ready to take on the egg forming and laying process. Additionally, yolk-less eggs are much smaller in size than regular eggs, and they might have thinner shells. These eggs are safe to eat. 

Common Yolk Quality Problems

Double/Multiple Yolks

Eggs with double or multiple yolks are very common in new layers. This happens when multiple yolks mature and release at the same time. There have been as many as 9 yolks in a single egg. 

Blood Spots 

If blood spots are in your egg's yolk, it can be an alarming sight. Blood spots range in severity from small spots of blood to almost a spoonful mixed in with the contents of the egg. 

This happens during the formation and maturing in the hen's ovary. Sometimes, when mature yolks are released they may rupture a small blood vessel. The blood released from there is then encased with the rest of the egg's contents. 

Causes of blood spots include vitamin deficiencies, continuous lighting in the coop, stress, and disturbances. 

Mottled Yolks

If a yolk is mottled, it will have many pale spots or blotchiness. This can be caused by diet, calcium deficiency, and thin eggshells. This problem gets worse with long egg storage, especially in poor conditions. 

Pale Yolks

If your hen's yolks look pale, it might be due to a lack of yellow or red pigments in their diet. 

Discolored Yolks

The way a chicken's yolk looks is usually in direct correlation with a hen's diet. Additionally, yolk color does not correlate with nutritional value. 

Common Albumen Quality Problems

Thin Watery Albumens

These albumens are caused by some diseases, high temperature for egg storage, poor coop ventilation/hygiene. Occasionally it is a reaction to vaccinations. This is also common in older layers. 

Odd Colored Albumens

Green Egg White: This can be worrying because it is not a common occurrence. Reasons include high riboflavin content (B2), high chlorophyll content, bacterial contamination, and improper storage. 

Yellow Egg White: Reasons for this include high riboflavin content, improper egg storage, eggs that are older and have been stored for a while. 

Cloudy Egg White: This means that the eggs are fresh, carbon dioxide hasn't had enough time to disperse through the eggshells. Another reason includes freezing the eggs. This can be during storage or eggs that sat overnight in a below-freezing coop. 

Watery Egg White: This can mean that the eggs are stale, your hens are older, or certain diseases like infectious bronchitis.  

Meat Spots 

These spots usually look like bits of dirt and vary in color from dark brown to red. Additionally, they vary in size from little specks to a few millimeters.

This happens when little bits of the oviduct lining was shed during the egg formation process. Some might be broken down blood spots. This happens commonly in older layers. Eggs with meat spots are safe to eat. 

Do you have an experience with problem chicken eggs? Let us know in the comments!