Some cancers and cancer treatments can cause nausea and vomiting. Feeling anxious can also make you feel or be sick. There is an area in the brain called the vomiting centre. This controls nausea and vomiting. Different things can stimulate the vomiting centre and make you feel sick.

Feeling sick (nausea) | Maggie's

Other ways of controlling sickness | Coping with cancer | Cancer Research UK

Relaxation techniques can calm the mind and reduce muscle tension. For some people, this helps reduce anxiety and stress. This may help with nausea.

Mind-body therapies for coping with cancer treatment | Macmillan Cancer Support

During acupuncture, a therapist places fine sterile needles just below the skin at certain points on the body. Acupuncture may reduce symptoms, such as sickness or hot flushes.

Acupuncture | Macmillan Cancer Support