Constant burps, side effects of chemo and herceptin?

[Nikita1806]

My mother diagnosed with stage 4 breast cancer mets to lungs and liver is having contant burp since last few days. She finshed chemo last week and will be on herceptin for an year.

Do people on chemo and herceptin face this issue?

Her liver mets got cleared after 3rd chemo and lung nodules are dormant and was declared as ground glass opacties during lady scans.

Anything to worry about?

Thank you.