Is a Belly Lump Normal in Cats After Spay Surgery?

Cat getting examined by a Veterinarian

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It is not uncommon for a cat to develop a lump after abdominal surgery like a spay (ovariohysterectomy). But, you may wonder if this lump is normal or a cause for concern.

If you see a lump near your cat's surgical site, you should contact your veterinarian as soon as possible—they are the best resource to determine the cause. But, if you're beginning to wonder what could've caused a lump, we're breaking down a few reasons below, as well as at-home care tips.

Reasons for a Lump at the Surgery Site

A postoperative lump or swelling at the surgery site can mean a few different things. First things first: if you see a lump near your cat's surgical site, you should contact your veterinarian as soon as possible. Your vet is the best source of feline health advice.

Because surgery involves cutting into healthy tissues, it obviously requires some healing afterward. Some swelling at the incision is to be expected as the body heals. However, major swelling is not normal and requires immediate attention.

Suture Knots

If you see a small bump at one end of the incision, it may simply be the knot of the sutures. If your cat has visible stitches, you are only seeing the outer layer. Surgical closure involves a few layers. First, the vet sutures the body wall. Next comes the closure of connective tissue between the body wall and skin. The skin closure is the final layer and may be done in a way that you may not even see the stitches (tissue glue may be used to help close the skin here). However, the sutures still need to be secured in place. Vets do this by tying a knot. Often, this knot is buried to keep it out of reach of a self-grooming cat. Under the skin, this knot may look like a worrisome lump. However, it may not be a major concern, as long as it isn't red, irritated, oozing, or painful.

Fluid Buildup

Mild to moderate swelling may occur when the body has a minor reaction to the suture material. This can cause fluid to build up, also called a seroma. However, if your cat is developing an infection, the fluid may be pus (indicative of inflammation). If you notice a lump that is getting larger, is warm or hot to the touch, or is oozing fluid, you will need to see your vet. Your cat may need antibiotics or other medications.

Scar Tissue

As wounds heal, the body makes scar tissue. If there's an excess of scar tissue, it can look like an abnormal lump. Scar tissue typically feels firm and ropy. It should not be painful or leak any kind of fluid.

When to Contact the Vet

Your vet will give you postsurgical instructions for at-home care. It is important that you read and follow these instructions, as they are specifically for your cat. These instructions will often tell you what you should watch for, as your cat heals.

When in doubt, contact your vet. You will need to take your cat to see the vet if you notice any of the following:

  • The area of swelling is painful when touched gently
  • The skin over the swelling is discolored
  • The swollen area feels warm or hot to the touch
  • Bleeding or discharge coming from the incision
  • The incision appears open or irritated
  • Your cat is still lethargic or not eating several days after surgery
  • Your cat has a rectal temperature over 103.5 degrees Fahrenheit
Post Abdominal Surgery Lumps in Cats

The Spruce / Julie Bang

Postsurgical Home Care Tips

Good communication with your veterinarian is key after any surgical procedure for your pet. However, there are a few general tips that can help to ensure your cat has a successful recovery and reduce the risk of a postoperative lump at the surgical site.

  • Monitor Carefully: Over the following two weeks that your pet is healing, it's important that you keep an eye on all of your cat's activities and body. Inspect the incision site one or two times a day, so you can recognize any changes. Inspect her urine for blood (a tiny bit may be normal in the first 24 hours) and her stool for any abnormalities. Look for those warning signs mentioned above such as any considerable changes in appetite, discharge, or swelling.
  • Keep Your Cat Within Sight: Surgery can be a temporarily traumatic event in a cat's life. Many cats instinctively want to hide after the experience. If your pet finds a hard-to-reach hiding place, you may not be able to monitor them properly. Do your best to block off any places in your home where they can potentially hide out of your reach, like the closets, the basement, or under furniture.
  • Prevent Licking: Cats groom themselves all the time, but their tongues are also filled with bacteria. Do your best to prevent your cat from licking the surgical site. If needed, an Elizabethan collar (called an "E-collar" or "the cone") can and should be used during the healing process. Although they may not like it at first, most cats get used to it.
  • Limit Activity: It is important to limit your cat's activity during the healing process. Vigorous movements or excessive play can cause the incision to open up. It's often best to confine your pet to a quiet room or spacious carrier when you won't be around to monitor their activity. Also, try to maintain calm in your household to help keep your pet at ease.
  • Administer Vet Meds Only: Your vet may have prescribed pain medication or other home treatments for your cat. It's important not to give your cat any other medications without consulting your vet. Never give a cat human medication or apply any ointments, creams, or similar products to the incision site that haven't been prescribed or recommended by the vet.
  • Avoid Baths and Water: Although this applies more to dogs, some cat owners give their cats a bath as well. Do not do this while they are healing, because water or shampoo may get into the incision. If your cat is one of the rare few that love water, avoid giving them any baths while they heal.
If you suspect your pet is sick, call your vet immediately. For health-related questions, always consult your veterinarian, as they have examined your pet, know the pet's health history, and can make the best recommendations for your pet.

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