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Wilms tumors occur most often in young children. These tumors often grow quite large before causing any symptoms. Children may look healthy and act and play normally.
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 sometimes large enough to be felt on both sides of the belly. It’s usually not painful, but it might be in some children.
Other possible symptoms
Some children with Wilms tumor may also have:
Loss of appetite
Shortness of breath
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 signs and symptoms of Wilms tumors are more likely to be caused by something else. Still, if your child has any of these symptoms, check with your child’s doctor so that the cause can be found and treated, if needed.