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Rob (Kentucky) on 11/05/2025: 
Warning
People with high blood pressure should avoid baking soda baths or consult their healthcare provider first. Baking soda (sodium bicarbonate) contains sodium, which can be absorbed through the skin and may increase blood pressure or cause complications for individuals with hypertension or heart conditions. Baking soda can be absorbed through the skin, introducing excess sodium into the bloodstream. High sodium levels can be dangerous for people with pre-existing high blood pressure, heart failure, or kidney disease.
Rob (Kentucky) on 11/02/2025: 
From the Book: A Friend in Need, Facts worth knowing about ARM & HAMMER BAKING SODA as a proven medical agent 1925.
Source: https://en.wikisource.org/wiki/A_Friend_in_Need
Sodium Bicarbonate “has been widely employed in the treatment of rheumatism and is found to be of great service in allaying pain and soreness in the joints when used in a lotion made by dissolving it in water and applying it to the part on lint or rag.” Use a saturated solution of two to four teaspoonfuls dissolved in a pint of water.
—Practical Therapeutics—9th Edit.
(Hare, page 720.)
Also use as a bath, adding one-half pound to one pound of Baking Soda in tub of water as hot as can be borne. Remain immersed in the water for fifteen minutes or more. Then go to bed to avoid exposure.
Note: Rheumatism is an outdated, general term for pain and stiffness in muscles, joints, and surrounding tissues, which can involve inflammation. It is now used to describe a wide range of conditions called rheumatic diseases, such as rheumatoid arthritis, lupus, and gout. The modern medical field uses more specific terms to diagnose and treat these diseases, which can be inflammatory or non-inflammatory.
