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Cannabis/CBD oil refers to products made from the cannabis plant, which contains natural chemicals called cannabinoids. The two main cannabinoids are cannabidiol (CBD) and tetrahydrocannabinol (THC). CBD does not cause a “high” and is often noted for potential effects like reducing pain, inflammation, or anxiety. THC is the compound that can cause psychoactive effects or a “high.” Cannabis products come in many forms, including oils, capsules, sprays, and dried plant material. CBD oil usually contains mostly cannabidiol and sometimes small amounts of THC.
People with cancer sometimes use cannabis or CBD oil to help manage symptoms caused by cancer or its treatments. Common symptoms include nausea and vomiting from chemotherapy, pain, muscle spasms, anxiety, loss of appetite, and sleep difficulties. Two cannabinoid-based drugs are approved by the U.S. Food and Drug Administration (FDA) specifically to treat chemotherapy-related nausea and vomiting, but cannabis or CBD oil products themselves are not approved to treat or cure cancer. These products are often considered part of supportive or complementary care to improve quality of life during cancer treatment.
You might hear terms like marijuana, cannabis oil, CBD oil, or cannabidiol during discussions about symptom management or supportive care. Some patients report relief from symptoms when using these products, but effects can vary widely depending on the product’s strength and composition. Cannabis/CBD oil is sometimes mentioned in medical records, treatment plans, or clinical trials related to symptom control. It’s important to understand that these products are not standard cancer treatments and should not replace prescribed therapies.
Using cannabis or CBD oil does not mean your cancer is being cured or that these products are a primary treatment. They are not replacements for standard cancer therapies or pain medications prescribed by your doctor. Because cannabis products vary widely in their ingredients and effects, assuming all cannabis or CBD oils work the same way can be misleading. Side effects and interactions with other medicines are possible, so careful use under medical guidance is important.
If you are thinking about using cannabis or CBD oil, it’s helpful to have an open conversation with your healthcare providers. You can ask whether these products might help your symptoms, what side effects or risks to watch for, how they might interact with your cancer treatments or other medicines, and where to find safe, reliable products. Your care team can help you understand if cannabis or CBD oil fits your treatment goals and how to use it safely alongside other therapies.
By federal law in the United States, cannabis remains illegal except in approved research settings, though many states have legalized medical or recreational cannabis with varying rules. Cannabis can affect mood, coordination, and other body functions, so it should be used carefully and under medical supervision. Side effects such as sleepiness, gastrointestinal upset, or changes in appetite may occur. Because cannabis products are not regulated like prescription medicines, their strength and purity can vary. This entry provides education but cannot replace personalized medical advice.
If you are curious about cannabis or CBD oil, consider bringing it up during your next medical appointment. Ask your care team about potential benefits and risks, possible interactions with your current treatments, and whether there are clinical trials or approved products suitable for your situation. This open dialogue can help you make informed choices that support your comfort and overall care during cancer treatment.
Public source information used for this glossary entry includes: