Signs and Symptoms of Wilms Tumors

Swelling or a large lump in the abdomen (belly)

This is often the first sign of a Wilms tumor. Parents may notice swelling or hardness in the belly while bathing or dressing the child. The lump is usually on one side of the belly, but sometimes it might be large enough to be felt on both sides. It’s usually not painful, but it might be in some children.

Other possible symptoms

Some children with Wilms tumor may also have:

• Fever
• Nausea
• Loss of appetite
• Shortness of breath
• Constipation
• Blood in the urine

Wilms tumors can also sometimes cause high blood pressure. This doesn't usually cause symptoms on its own, but in rare cases blood pressure can get high enough to cause problems such as headaches, bleeding inside the eye, or even a change in consciousness.

Many of the possible signs and symptoms of Wilms tumors are more likely caused by something else. Still, if your child has any of these symptoms, check with their doctor so the cause can be found and treated, if needed.