4. Constitutions with a predisposition to develop kidney stones (lithaemic constitutions). Benzoic acid should be considered for people who are careful with their diet yet develop stones in the kidneys all the time, accompanied by frequent kidney colic. There is frequent vomiting during the kidney colic which is usually left sided, but pains travel towards the right side as well.
As mentioned previously, the kidneys are affected in one way or another in this remedy. Renal insufficiency may occur, or chronic nephritis with dropsy and highly odorous urine, but more especially when the heart is also involved in which case the intensity of the heart symptoms alternates with the intensity of the kidney symptoms.
When the kidneys are chronically and seriously involved we see that the patient falls into a profound unrefreshing sleep. At other times he stays awake the whole night and is exhausted in the morning. In the period of wakefulness during the night, he dwells upon all the unpleasant subjects that he can think of. This state alternates with nights of stupid sleep for weeks. These fluctuations occur in accordance with the state of the kidneys. Further symptoms include puerperal albuminuria, uraemia and convulsions.
5. Another important symptom which so far has been totally neglected in this remedy is periodic asthma, especially in rheumatic persons. You will need to think of this remedy if the asthma appears after suppressed gonorrhea, where the kidneys seem to have been affected and do not function well. The asthma makes its appearance when the kidneys fail to eliminate properly and the urine is suppressed, scanty and strong smelling. Benzoic acid should also be considered in cases of: inflammation of bronchi and lungs, with great tenderness of chest, cough worse during night and lying on