The brownish color of urine is an abnormal urine color. Common physiological causes include less water consumption, fire caused by a hot diet, and other factors that lead to concentrated urine and deeper urine color, which can manifest as brownish color. In addition, large consumption of fruits such as carrots, grapefruits and oranges, as well as medications such as vitamin B2, can also cause the urine to darken brownish in color. In addition, the following conditions may also be considered: I. Common causes: 1. Hematuria: When patients have acute glomerulonephritis, urinary stones, or tumors, tuberculosis and other diseases, there can be flesh-washing, strong tea-colored or red hematuria visible to the naked eye, in which the strong tea color is similar to brown. In addition, prolonged hematuria can cause the accumulation of iron in the blood, resulting in a rust-colored change in urine, similar to brown; 2. Hemoglobinuria: due to factors such as hemolysis caused by blood group incompatibility, falciparum malaria and paroxysmal sleep hemoglobinuria, which cause the destruction of red blood cells in the blood vessels and the release of hemoglobin through the kidneys, resulting in hemoglobinuria, which is a thick tea-colored or soy sauce-colored brownish change; 3. Bilirubinuria: often due to abnormal liver function caused by obstructive jaundice and stem cell jaundice, etc., resulting in increased bilirubin into the urine, making the urine dark yellow or yellow-brown changes, and oscillating urine can appear yellow foam; 4. Myoglobinuria: strenuous exercise, heavy physical labor, and ischemic muscle injury caused by factors such as extrusion, electric shock, arterial embolism, can cause acute destruction of muscle tissue resulting in myoglobin The release of myoglobin, which is changed to red-brown color after excretion through urine, may make patients mistake it for brown urine. At this time, patients often have muscle weakness, swelling and pain; 5, melaninuria: urine contains melanin, often appearing black, gray-black or dark brown, mainly seen in extensive malignant melanoma, chronic hyperaldosteronism and other diseases. Second, treatment measures: 1. For hematuria caused by urinary stones, it is recommended to actively carry out extracorporeal ultrasound lithotripsy treatment, and at the same time, pay attention to drinking a lot of water to promote the discharge of stones. If there is blockage of the ureter, or scratching, etc., surgical treatment is feasible if necessary. In addition, regular review after treatment and daily attention to diet are recommended. 2. For patients with Mycobacterium tuberculosis infection, systematic, regular and full course of treatment with rifampicin and isoniazid are required as prescribed by the doctor. 3. For patients with urological tumors, surgery is feasible, supplemented with chemotherapy and radiotherapy to improve the prognosis. 4. In case of paroxysmal sleep hemoglobinuria, timely blood transfusion is recommended to avoid anemia, and glucocorticoids such as prednisone and dexamethasone should be taken if necessary; 6. In patients with chronic hyperaldosteronism, hormone replacement therapy can be used as prescribed by the doctor, and the primary disease can be actively sought. In general, patients can relieve symptoms after drinking more water and reducing the intake of the above-mentioned types of food. However, if the urine is brownish in color for a long time, it is still necessary to be vigilant and go to the hospital for a urine test in a timely manner, so that the doctor can clarify the cause and then provide targeted treatment.