Can tumors cause seizures?

Tumors affecting the brain or nervous system can cause seizures or behavioral changes, but other conditions can also trigger seizures. A vet should assess the cause through imaging and tests.

What does a tumor work-up typically involve?

Common tests include physical examination, X-rays, ultrasound, cytology or tissue biopsy, and — when needed — advanced imaging such as CT or MRI for a complete assessment and staging.

How much does tumor treatment typically cost?

Costs depend on the type of treatment — surgery, chemotherapy, or medical management — and the complexity of the case. Ask your vet for a personalised quote and to discuss the options available.

How should I care for my pet after surgery or during chemotherapy?

Follow the vet's instructions for regular check-ups to monitor wound healing, appetite, and mental state; adjust the diet to maintain body weight; and contact your vet immediately if anything unusual arises.

How much do tests and treatment for this condition typically cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Tumors in Dogs & Cats: Seizures, Lumps, and Treatment Guide [2025]

Common brain tumor symptoms include seizures and behavioral changes; treatment options include surgery, radiation therapy, and medical management.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ACVIM, AVMA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Frequent seizures that cannot stop on their own
•Sudden loss of consciousness or repeated fainting episodes
•Noticeably rapid or labored breathing

Schedule a Clinic Visit Soon (within 24–72 hours)

•Intermittent seizures with brief recovery between episodes
•Unsteady gait or stumbling while walking
•Significantly reduced appetite lasting more than two days

01What Symptoms Signal a Problem?

Tumors can cause local or systemic changes in different parts of the body, commonly including neurological, behavioral, and appetite abnormalities.

Recurring or persistent generalised seizures
Unsteady gait, stumbling, or frequent loss of balance
Changes in mental state such as lethargy or unusual agitation
Decreased appetite or a noticeable reduction in food intake over a short period
Persistent unexplained weight loss

Seek emergency care immediately if you notice the following symptoms:

⚠️ Frequent seizures or seizures that won't stop on their own
⚠️ Brief loss of consciousness or fainting episodes
⚠️ Rapid or clearly laboured breathing

02How to Assess Abnormal Signs at Home: Observation Tips and When to Go to the Emergency Vet

Keeping systematic records and capturing photos or videos before your vet visit helps the doctor quickly understand your pet's condition and plan the necessary tests.

Note when symptoms first appeared and how often they occur
Log daily changes in alertness and activity level
Measure and record body weight and daily food intake
Record water intake, frequency of urination and defecation, and any abnormalities
Film any seizures or gait abnormalities to show the vet
If possible, book an early appointment at a specialist clinic with imaging and pathology capabilities

03How Will the Vet Make a Diagnosis? Common Tests and Procedures

The vet will combine physical examination, imaging, and pathological tests to determine the location, nature, and extent of the lesion as the basis for treatment planning.

Physical examination

palpation and basic neurological assessment

X-rays

to assess the skeleton or any lesions in the chest and abdomen

Ultrasound

to evaluate characteristics of internal organ or subcutaneous masses

Cytology or tissue biopsy

to confirm cell type and invasiveness

CT or MRI

advanced imaging to evaluate the brain or complex lesions

Referral to a hospital with advanced imaging and pathology capabilities is recommended

04What to Expect After Diagnosis: Medications, Diet, and Home Care Guide

Tumor treatment options are diverse; regular follow-up visits after surgery or medical therapy are required, and key home-care guidelines should be observed.

After surgical removal, schedule regular check-ups to monitor wound healing and recovery
During chemotherapy or oral medication, attend scheduled follow-ups to track side effects and response
Adjust diet as directed by the vet to maintain adequate nutrition and body weight
Home care includes rest, wound care, and monitoring for changes in symptoms
Regular imaging or blood tests to assess treatment response and the risk of recurrence
Contact the clinic immediately if any unusual changes occur to arrange a follow-up visit

05What to Prepare Before the Vet Visit: Key Information to Help the Vet Identify the Cause

List when symptoms first appeared, how often they occur, and how they have changed

Bring a recent record of body weight and daily food intake

Prepare a log of urination, defecation, and water intake

Bring a list of all current medications and supplements

Provide videos of seizures or gait abnormalities and any previous test reports

Ask when booking whether the clinic has advanced imaging and pathology equipment

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.