Some doctors are using baking soda to treat yeast infections and even cancer. There is not enough research to prove that baking soda is an effective tool for treating cancer patients, but some doctors are using this alternative medicine. In these cases, baking soda is given via the mouth or into a vein. It’s also given intra-arterially (into an artery supplying blood to the tumor) and is sometimes given as a solution directly through the windpipe and into the lungs to treat lung cancer. (3)

Baking Soda Side Effects

Using baking soda on the skin or body is safe and nontoxic. Consuming baking soda orally is also safe, but don’t exceed the recommended dose. Too much baking soda can upset the body’s acid-base balance; it can also cause nausea and diarrhea when used in excess; it may also cause stomach cramps and an increase in thirst. (4)

Because baking soda is high in sodium — 1,259 milligrams in one teaspoon — high doses aren’t safe, for such doses can raise your blood pressure and cause swelling. In severe cases, it can overload circulation and lead to heart failure. People who consume too much baking soda have reportedly developed blood chemistry imbalances and heart malfunction (ineffective pumping). (5)
If you have edema, liver disease, kidney disease or high blood pressure, you should avoid taking baking soda internally. You should also refrain from consuming baking soda if you are pregnant or breastfeeding.
 
Do not allow children under the age of five to consume baking soda.
If you are on prescription drugs, consult your doctor before consuming baking soda, and make sure you speak to your doctor about drinking baking soda if you are on a sodium-restricted diet.
Some products that may interact with baking soda include aspirin and other salicylates, barbiturates, calcium supplements, corticosteroids, medications with a special coating to protect the stomach, lithium, quinidine, and diuretics.