What could cause a big lump on the stomach of female cat that was fixed seven days ago?

There are a few possible causes for a big lump on the stomach of a female cat that was fixed seven days ago.

* Seroma: A seroma is a collection of fluid that can form after surgery. It is usually harmless and will resolve on its own within a few weeks.

* Hematoma: A hematoma is a collection of blood that can form after surgery. It is usually more serious than a seroma and may require treatment.

* Abscess: An abscess is a collection of pus that can form after surgery. It is a serious complication and requires immediate treatment.

* Hernia: A hernia is a weakness in the abdominal wall that allows tissue or organs to protrude through. It can be caused by surgery or trauma. Hernias can be serious and may require surgery.

* Tumor: A tumor is a growth of abnormal tissue. It can be benign (non-cancerous) or malignant (cancerous). Tumors can occur anywhere in the body, including the stomach.

If you are concerned about the lump on your cat's stomach, it is important to take her to the vet for diagnosis and treatment. The vet will be able to determine the cause of the lump and recommend the best course of action.