A deficiency of NAT PHOS often causes stiffness and swelling in the tissues around the joints. This remedy often relieves diarrhea, colic, vomiting, sleeplessness and fever due to acid conditions of the stomach. General acidity, digestive upsets and heartburn along with rheumatism and back Discomfort are indication for the remedy Nat Phos. Symptoms are generally worse with exertion and better with rest.

Nat Phos is specifically useful for the symptoms of : Acidity - There may be gastric disturbances, irritation of the skin and mucous membranes, twinges of rheumatism, headaches and a persistent feeling of tiredness, all symptoms of acidity. Diarrhea of teething children with sour smelling, greenish stools. Headaches on the crown of the head on awakening and sick headaches with acid symptoms, especially after wine or milk are symptoms of Nat Phos.