CAM stands for complementary and alternative medicine, a broad term covering health practices and products used outside of conventional Western medicine. The distinction between “complementary” and “alternative” comes down to how these approaches are used: complementary means alongside standard medical treatment, while alternative means instead of it. About 36.7% of U.S. adults reported using at least one complementary health approach in 2022, nearly double the 19.2% who said the same in 2002.
Complementary vs. Alternative vs. Integrative
These three terms often get used interchangeably, but they describe different things. A therapy is complementary when it’s added to your conventional care. If you’re receiving physical therapy for back pain and also getting acupuncture, the acupuncture is complementary. The same therapy becomes alternative if you skip the physical therapy entirely and rely on acupuncture alone.
Integrative health is a newer framework that coordinates both conventional and complementary approaches into a single treatment plan. Rather than a patient independently seeking out yoga or massage on top of their regular care, integrative health means providers from different disciplines actively collaborate. The focus is on treating the whole person, not just a single condition or organ system, and it often combines multiple interventions like medication, psychotherapy, acupuncture, and movement practices in a deliberate, coordinated way.
The Five Major Categories of CAM
CAM therapies generally fall into five domains:
- Alternative medical systems: Complete systems of theory and practice that developed independently of Western medicine. These include Ayurveda (originating in India over 5,000 years ago), traditional Chinese medicine, homeopathy, and naturopathy. Each has its own diagnostic methods and treatment philosophy.
- Mind-body interventions: Practices that use the connection between mental focus and physical health. Yoga, meditation, tai chi, deep-breathing exercises, music therapy, art therapy, and dance/movement therapy all fall here.
- Biologically based therapies: Natural products like herbal supplements, vitamins, minerals, probiotics, amino acids, and botanical extracts. This is one of the most widely used categories.
- Manipulative and body-based methods: Therapies based on physical manipulation or movement of the body, including chiropractic care, massage therapy, and osteopathic manipulation.
- Energy therapies: Practices that work with energy fields either within or outside the body. Examples include Reiki, qi gong, therapeutic touch, and therapies using electromagnetic fields. The biofields these therapies claim to influence have not been experimentally proven to exist.
Which Therapies People Use Most
According to NIH analysis of national survey data, meditation was the most popular complementary approach in the U.S. by 2022, used by 17.3% of adults, up from 7.5% in 2002. Yoga saw similarly dramatic growth, rising from 5% to 15.8% over the same period. Massage therapy also grew significantly. Acupuncture, while still less common at 2.2% of adults, more than doubled its usage from 1% in 2002, partly driven by expanding insurance coverage.
How Mind-Body Practices Affect the Body
Mind-body therapies aren’t just about relaxation. Movement-based practices like yoga and tai chi reduce systemic inflammation, help regulate the balance between your “fight or flight” and “rest and digest” nervous system responses, and stimulate natural compounds in the body that have pain-relieving and mood-boosting effects. Moderate-intensity exercise, for instance, raises levels of the body’s own cannabis-like molecules more effectively than light exercise, which may partly explain its benefits for anxiety and depression.
Mindfulness meditation works differently. It reduces rumination (the tendency to replay negative thoughts), improves cognitive flexibility, and fosters better emotional regulation. Brain imaging studies show that meditation is associated with structural and functional changes in neural networks involved in attention, self-awareness, and emotion regulation. Research in children with cancer found that focused breathing meditation was linked to lower activity in the brain network associated with distress and repetitive negative thinking.
Safety Risks and Drug Interactions
One of the most important things to understand about CAM is that “natural” does not mean risk-free. Herbal supplements can interact with prescription medications in serious ways. Ginkgo biloba taken with the blood thinner warfarin increases the risk of major bleeding. Goldenseal extract can reduce blood levels of the diabetes drug metformin by about 25%, potentially enough to interfere with blood sugar control. High-dose green tea can reduce the effectiveness of certain blood pressure and cholesterol medications.
St. John’s wort is one of the most problematic supplements for drug interactions. It interferes with immunosuppressants, antiretroviral drugs used to treat HIV, oral contraceptives, blood thinners, heart medications, and anti-anxiety drugs. Even chamomile may reduce the effectiveness of birth control pills and can interact with blood thinners and sedatives.
These interactions matter because many people take supplements without telling their doctors, and unlike prescription drugs, dietary supplements don’t go through the same approval process. Under the 1994 Dietary Supplement Health and Education Act, manufacturers are responsible for evaluating the safety and labeling of their own products before selling them. The FDA can only take action against a supplement after it’s already on the market and found to be adulterated or mislabeled. This means the burden of proof is essentially reversed compared to prescription medications.
Practitioner Licensing and Training
Licensing requirements for CAM practitioners vary by state and by discipline. Acupuncturists in California, for example, must complete 3,000 hours of training, including 2,050 hours of classroom education and 950 hours of clinical practice. They must pass a state licensing exam and complete 50 hours of continuing education every two years. Chiropractors, naturopaths, and massage therapists each have their own state-specific requirements, and some states regulate certain practices more strictly than others. If you’re considering seeing a CAM practitioner, checking whether they’re licensed in your state is a practical first step.
Insurance Coverage
Coverage for CAM therapies is inconsistent and often limited. Acupuncture, chiropractic care, and massage therapy are the three approaches most likely to be partially covered by private insurance, though full coverage is less common. Many plans require preauthorization, a referral, or use of an in-network provider. Some insurers offer discount programs where plan members still pay out of pocket but at reduced rates, and some plans require a separate rider or supplement to cover complementary therapies at all.
Medicare and Medicaid coverage varies as well. Medicare has expanded coverage for certain therapies in specific situations, but the details change, so checking directly with your plan is the only reliable way to know what’s covered. Key questions to ask your insurer include whether the specific therapy is covered for your condition, whether there are visit limits, and how much you’ll pay out of pocket.