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What Illnesses Cause Low-Grade Fever? [Solved]

A persistent low-grade fever can be caused by a number of things, like respiratory infections, urinary tract infections (UTIs), medications, teething in infants, stress, tuberculosis, autoimmune diseases and even thyroid issues. So if you’re feeling under the weather and have a low-grade fever that won’t go away, it’s best to get checked out by your doctor.