My mother just started chemotherapy , but she is not feeling good she wants to stop the chemo treatment's ?

Talk to the Doctor: Make sure the doctor or the health care provider is aware of this. They will probably be able to help and reduce the side-effects. Many times the doctor or non-physician provider is totally unaware that the person has been having a problem until they come in for their next visit. The time to deal with this is right away so call that number the office gives you to reach a provider.

Her decision: Ultimately it is her decision. However, i would encourage her to have a full discussion with her oncologist.