In the early stages of tuberculosis, as the condition is relatively mild, many patients have no symptoms or only mild symptoms. Typical symptoms include coughing, expectoration, night sweats, fatigue, low-grade fever, poor appetite, and weight loss, but these are not specific to tuberculosis. If these symptoms persist for more than two weeks, tuberculosis should be suspected, and a chest x-ray or other examinations should be performed for further clarification. If the x-ray suggests tuberculosis, further tests such as a tuberculin skin test should be conducted to confirm the diagnosis.