How common is abdominal swelling in Wilms Tumour?

Wilms Tumour develops in the kidney and can enlarge the side or front of the abdomen. A child may also have tummy pain, reduced appetite, fever, nausea or changes in urine, though these features vary. Constipation, infection, a hernia and other childhood conditions can also cause a swollen abdomen.

Book a prompt assessment for a new or persistent swelling, especially if it is firm, one-sided or getting larger. Avoid pressing repeatedly on the area. Note when it was first seen, whether pain or fever is present, and any change in urine, eating, energy or bowel habits. A clinician will decide whether examination and imaging are needed.

Get urgent help if the child has severe pain, repeated vomiting, unusual sleepiness, difficulty breathing, fainting, heavy blood in the urine or a rapidly enlarging abdomen. If Wilms Tumour is already being assessed or treated, follow the oncology team's instructions for sudden changes.

Ask whether the swelling seems to arise from the abdomen or another cause, which symptoms need same-day review, and whether urine tests or imaging are appropriate. Ask how to keep your child comfortable and whether normal activity should be adjusted while assessment is underway.