If milk, wheat, and egg allergy can cause rhinitis, they can also result in vaginitis, urethritis, and cystitis. The kidneys present a large filtering surface to blood contents and are vulnerable to damage by circulating immune complexes containing food allergens. The child's report of flank pain often imitates an attack of kidney infection or renal colic. Children with food allergy may have fever with flank pain and frequency of urination and are often invasively investigated and treated with no thought to a food antigen origin of their problem. Glomerulonephritis may sometimes be triggered by CIC's containing food protein antigens.
Parents can use urine test sticks at home to monitor their child's urine everyday.
Distribution of Antigen Food antigens make their way through human bodies in a remarkable fashion. Consider the long and improbable path of milk proteins through a mother's gut, into her blood, through her liver, out into her breast milk, through her infant's gut mucosa and into the infant's nasal mucosa to cause rhinitis, the lung to cause asthma, or the skin to cause eczema. There are many potential paths from mouth to target organ for food antigens to follow. Every tissue of the body can manifest a food allergic response. Manifestations include both systemic symptoms such as flushing, fever, aching, fatigue, and also localized target organ activity, usually some form of inflammation, manifest as pain, swelling, erythema, and local heat.