It can have many causes, from constipation to gallbladder, stomach, or pancreatic problems
D., Brunker, C., Hopkins, R
The economic impact of ME/CFS: individual and societal costs
For comparison, here are the common symptoms of both sulfur and histamine intolerance: Overlapping histamine intolerance and sulfur intolerance symptoms: Headaches/Migraines Flushing/Hives Joint pain/Body pain Itchiness Palpitations/Sudden blood pressure changes Inflammation GI pain/Constipation/Diarrhea Shortness of breath Fatigue/Cognitive impairment In cases of candida and SIBO, sulfate-reducing bacteria in the gut produce excess hydrogen sulfide gas when they ferment carbohydrates, further disrupting microbiome health , inducing an immune response, and increasing intestinal permeability and gut inflammation (Figliuolo et al., 2017)

Additional functions include 9,10 : Balancing blood pH Facilitating the conversion of vitamin D into its active form (ie, 1,25-dihydroxycholicalciferol) Producing hormones that help control blood pressure and red blood cell production Maintaining normal blood concentrations of electrolytes (eg, potassium, sodium, phosphorus, and calcium) Kidney damage and the loss of function may gradually lead to CKD