Complementary Therapies in Cancer Care: What the Evidence Says

When facing a cancer diagnosis, many people look for ways to feel better and cope alongside conventional treatment. Some non-medical practices can help with symptoms, side effects and quality of life when used in addition to, not instead of, medical care. It’s important to understand the difference between complementary therapies and alternative therapies — and to talk to your treatment team before trying anything new. Cancer Research UK

Complementary Practices with Evidence of Benefit

Mind-Body Therapies

Practice like meditation, yoga and mindfulness-based stress reduction (MBSR) can help manage anxiety, depression and improve quality of life. A high-quality review notes benefits for stress, mood and mental wellbeing. Breastcancer.org

  • Meditation/MBSR — supports coping with stress and anxiety. NCCIH

  • Yoga — can improve mood, reduce anxiety and help with fatigue and sleep in people with cancer. Breastcancer.org

These therapies are generally safe when practised under guidance and discussed with clinicians.

Acupuncture and Physical Supportive Care

Some studies support acupuncture or acupressure for specific treatment-related symptoms:

  • Nausea and vomiting during chemotherapy — acupuncture may help reduce frequency.

  • Other reviews of complementary approaches suggest acupuncture can be helpful for certain symptoms, although evidence quality varies. PubMed

Massage, gentle exercise and relaxation techniques also fall under supportive care, with many people finding them helpful for stress relief and comfort. Cancer Council SA

Traditional Chinese Medicine (TCM) and Herbal Medicine

Traditional Chinese medicine (TCM), including herbal formulas and acupuncture, is widely used as complementary care, especially in East Asia. Surveys suggest a high prevalence of use; for example, many patients with breast cancer in China report using herbal medicine to support immune function or reduce treatment side effects. PubMed

Some systematic reviews find that Chinese herbal medicine combined with chemotherapy may improve tumour response, quality of life and reduce nausea and vomiting compared with chemotherapy alone. However, the trials so far are generally small and of variable quality, so firm conclusions can’t yet be drawn. PMC

Acupuncture — a key TCM modality — is often used to help with treatment-related symptoms such as nausea or fatigue, though evidence is mixed and more high-quality research is needed. PubMed

Important caution: Certain herbs may interact with cancer drugs or affect hormone-sensitive cancers; stop any new herbal supplement without your clinician’s agreement.

Relaxation Frequencies and Mind-Body Support

There’s growing scientific interest in mind-body practices — including guided imagery, breathwork and relaxation techniques — for easing anxiety, stress and mood symptoms during and after cancer treatment. Major clinical guidelines recognise that mindfulness, yoga and massage can improve quality of life and support emotional resilience. PubMed

Some people also explore “frequency” or sound-based and music therapies for relaxation or stress relief and guided relaxation have been studied as supportive care, helping reduce anxiety, improve sleep and enhance emotional wellbeing during treatment. PubMed

Supplements After Treatment

Many cancer survivors consider supplements to support recovery. However, current clinical practice guidelines do not strongly recommend supplements for managing treatment side effects because evidence is limited and sometimes conflicting. In some cases, high-dose antioxidants or unregulated products might interfere with therapies.

Some findings highlight potential benefits of specific supplements (like vitamin D or omega-3s) for general health in some populations, but effects on breast cancer recurrence or treatment outcomes are not conclusive and vary widely depending on dose, formulation and individual health. Always get personalised guidance from your oncology team before starting any supplement.

What We Don’t Know Yet

Researchers are still studying many complementary therapies. In some cases, the evidence is promising but not strong enough to make broad clinical recommendations:

  • Herbs and supplements often lack consistent trial data, and some can interact with treatments.

  • Certain practices commonly marketed as “alternative cures” have no reliable evidence they treat cancer and may delay vital care. Cancer Research UK

  • Some treatments once thought helpful (e.g., acetyl-L-carnitine for neuropathy) may not be recommended due to potential harm. Breastcancer.org

Always check with your oncology team before using herbs or supplements, especially during chemotherapy or radiotherapy, as some may reduce treatment effectiveness. Cancer Research UK

How to Use Complementary Therapies Safely

  1. Talk with your clinician first — your medical team knows your treatment plan and can advise risks.

  2. Choose reputable providers — trained professionals with experience in cancer care.

  3. Use complementary therapies alongside medical treatment, not as a replacement.

  4. Watch for interactions — herbs and some supplements can affect chemotherapy or hormone therapies.