Thanks for your question on Health Care Magic. I can understand your mother s situation and problem. Chemotherapeutic drugs are known to cause gastritis, vomiting and bloating. So side effects from the cancer drugs can be the cause for her symptoms. Another possibility is metastases to stomach and intestine. So better to get done 1. Upper GI (gastrointestinal) scopy. 2. CT scan of abdomen. If both these are negative for metastases then possibility of gastritis and related symptoms is more. So she will improve with proton pump inhibitors and prokinetic drugs. So consult her treating doctor and discuss all these. Hope I have solved your query. I will be happy to help you further. Wishing good health to your mother. Thanks.