Whether mucus filament 400/μL is serious or not needs to be decided according to your own situation. If it is just a simple mucus filament 400/μL without the phenomenon of frequent, urgent and painful urination, it may be due to leukorrhea secretions mixed with urine during routine urinalysis. If red blood cells and protein appear at the same time, the symptoms are more serious and may be due to inflammation, and a recheck may be performed. Mucus filaments are substances secreted from the urinary tract, and their presence in large amounts may be due to inflammation or irritation of the urethra, and their secretion increases if you have a urinary tract infection. The increase in mucus filaments is also related to the concentration of urine, so you can drink more water to dilute the toxins in the urine and promote the body’s metabolism. Inflammation caused by increased mucus filaments treatment should also pay attention to diet, to drink more water, eat less spicy and stimulating food, so as not to aggravate the disease. Usually, you can do more physical exercise to enhance physical fitness, pay attention to warmth and personal hygiene to reduce the possibility of urinary tract infection.