Causes of Blood Stool in Cats After Deworming – Things You Need to Know

​Deworming is a way to protect your cat from possible intestinal parasites. However, it’s very horrifying to find out that there is a present blood in cat stool after the deworming process. This blood often called hematochezia which can be a minor outcome of intestinal parasites or other signs of possible serious medical health. The blood from the stool can be light with or without symptoms occur.
Hematochezia is the bleeding in the lower part of intestines. It can be coming from the rectum or colon which causes bright blood in the stool. Melena is another term use for blood in stool. The only difference is that; melena has a dark color blood due to the bleeding coming from the highest part of the intestines.


If blood is present on your cat’s stool, always check for the color. Usually you’d find it in color light or dark blood. If they appear to be acting normally, blood can be a cause of gastrointestinal upset due to overeating and food that are not acceptable by his digestion. There are also feline friends that are sensitive to anxiety and instant change in environment. Rapid change of cat food can also cause this issue. Watch out for persistent blood in the stool, diarrhea and vomiting. If the cat appears to be anxiety and lethargic, it can be a sign of serious medical condition. In this case, contact the nearest veterinary in your area.

What are the other causes of blood in cat stool after deworming?

  • Intestinal worms – Intestinal worms such as cryptosporidium causes swelling in the intestines that results to bleeding. Roundworms and hookworms are also possible intestinal parasites that affect blood in the stool. They could suck the blood from the intestinal wall. Have your kitten undergo intestinal parasite check to confirm the condition in order to give the right medication.
  • Constipation – Constipation is one way to occur blood from the stool. It damages the anus and irritate it that causes blood stain. There are times that feces are hardened and when it passed, a slight tear arise in the anal that causes the blood.
  • Bacterial Infection – Watch out for E.coli and Salmonella that causes the inflammation in the colon part or what they called colitis. Talk to your veterinarian about this.
  • Swelling or Impacted Anal Glands – There are times that this gland is swelling or impacted that leads to infection or abscess. They produce a solid, foul smelling substance when the cat defecates. As the time goes by, these glands have the possibility to break and causes inflammation on the anal glands.
  • Polyps – Rectoanal polys is commonly seen in cats. They are not cancerous but can grow in the rectal area. Symptoms include difficulty defecating, blood in the stool and obvious polyp from the anus.
  • IBD- IBD or Inflammatory Bowel Disease is a result from penetration of inflammatory cells getting into the GI tract that causes the inflammation. The exact medical explanation is the yet understood. Symptoms present are diarrhea, blood in stool and chronic vomiting.
  • Cancer – Cancer can exist from any part of intestinal walls and rectum area that leads to bleeding. Owners must be also aware that there are different types of cancer that can possibly develop depending on its originating cell. Types of cancers are mast cell cancer, adenocarcinoma, lymphoma and neoplasms. Watch out for sudden weight loss, blood with diarrhea, lethargic, anorexia and abnormal growth in the abdomen.
  • Swelling in the lining of the large intestine which is called colitis—Colitis develop due to stress, nutrition, infection, intestinal parasites or cancer. Look for the symptoms such as blood in stool, diarrhea, recurrent liquid stools and loss of appetite.
  • Blood Clot – It can be associated to decrease number of platelet counts or bleeding disorder where in the blood doesn’t normally clot. This term is called hemophilia. Most of this condition is inherited. There is also another form of blood clot that can be related to liver disease or poisoning.
  • Blood present on your cat’s stool is not something to be ignore of. It is always best to consult this to your veterinarian. Cats that develop symptoms like loss of appetite, excessive vomiting and lethargic, take them to the nearest vet as soon as possible to figure the cause of such condition. What are the other signs and symptoms to look for?

Your feline friend may experience other things aside from the symptoms provided above. If severe blood is present in the stool, check out for any mucus. Here are the lists of other symptoms related:
Stomach seems to be sensitive to any type of food – During the deworming process, there are a lot of things happening inside your cat’s tummy. There are cases that they vomit right after the deworming because of the high effectivity of the medication to eliminate parasites which is Hyper salivation in cats after receiving deworming medication is normal side effect. It will usually subside after 2-3 days. If you notice your cat producing small bubbles from the mouth than salivating, take them to the vet asap. This can be a sign or rabies or other serious medical condition.

How to Diagnose Blood in The Stool?

The vet may ask for fecal examination for proper diagnosis. There are cases that vet may conduct a complete medical tests for your friend and ask a medical history. The vet may ask for the stool details such as color, how firm it is and if there is a blood present on the stool. Firm stool usually caused by constipation, anal gland inflammation or polyps wmoving inside the intestines. After 1 hour of taking the medication and your cat exhibit vomiting, please consult it with the nearest vet in your area. Remember that excessive vomiting causes dehydration and you don’t want your feline friend to get dehydrated. Fluids and other necessary treatments will be given to him. 

Decrease Appetite

Deworming treatments are very strong. Though some owners are worrying about the effectivity of the medication, you must put in mind that the goal of doing this is to eliminate parasites inside your cat’s intestines. Do not be surprise if you see them decrease its appetite, it’s normal and will only last for few days. After 3-4 days and this symptom is still present, contact your vet immediately. In this case, your feline friend may need some medical help.

Loose and Watery Stool

After giving the deworming treatments, it's normal for cats to have a watery stool. You may also see some worms from the stool including blood. These symptoms last for only 2-3 days and if diarrhea continue to occur, take them to vet immediately. The vet doctor may be prescribed prednisone or metronidazole which limit the inflammation related to inflammatory bowel disease.

Hyper salivation or Excessive production of saliva

While water stools can be related to infections and swelling. Other tests are: 

  • Test to see present of parasites
  • Urinalysis
  • CBC to diagnose infection
  • Xrays to assess foreign bodies inside intestinal tract
  • Ultrasound
  • Biopsy – only applicable if the vet found any mass
  • Colonoscopy to examine the inner lining of the large intestine

What are the treatments that the vet will prescribe?

Medications depend on the causes of the blood but vet can prescribe the following treatments: 

  • Deworming medications
  • Antibiotics
  • If the blood is associated with allergy, the vet may order food elimination diet.
  • If tumors are present, surgery is needed
  • If foreign bodies are present, the vet may perform Enema or surgery
  • To prevent dehydration, IV will be given.
  • Laxatives to soften the stool caused by constipation

There are many causes of blood in your cat’s stool after the deworming treatment. It is important for cat owners to understand the symptoms to look for and when is the right time to take your cat in veterinary care.
For home care, follow the medications prescribed by the vet and dietary recommendations. Observe your cat’s overall activity and appetite. Watch closely for any worsening signs and symptoms. If this happen, let your vet know about the changes and current condition.

About the Author Evelyn

My name is Evelyn, creator of PlaywithMeow!, I created Play with Meow to connect, share and inspire other cat lovers around the world, hoping we all utilize this community to make a better life for our cats.

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