When to worry about abdominal swelling with primary peritoneal cancer

Primary peritoneal cancer can irritate the lining of the abdomen and affect fluid movement there. Fluid build-up, called ascites, may make the tummy feel full, tight, heavy, or uncomfortable. Changes can also reflect constipation, treatment effects, or another abdominal problem, so the pattern and examination matter.

Tell your oncology team when the swelling began, whether it changes during the day, and whether your weight, appetite, bowel movements, or urination have changed. Note pain, breathlessness, nausea, and fever. Wear comfortable clothing, take medicines only as directed, and do not try to drain abdominal fluid yourself.

Seek urgent medical help for severe or worsening abdominal pain, a hard or very tender abdomen, repeated vomiting, faintness, confusion, fever with chills, or new difficulty breathing. A swollen abdomen with inability to pass stool or urine also needs urgent assessment. If breathing is severely difficult or you feel faint, use emergency services.

Ask whether the swelling could be ascites, constipation, or another treatment-related problem; which symptoms should trigger a same-day call; whether you need an examination or scan; and how your team would manage fluid if it is causing pressure or breathlessness.