There is still a small amount of fluid in the drainage tube one month after liver cyst surgery, which is normal if there is no other symptom; if it is caused by postoperative complications, it is considered abnormal. 1. Normal phenomenon: there is still a small amount of fluid in the drainage tube about one month after liver cyst surgery, but there is no other adverse reaction, and the patient does not feel any discomfort, which is usually a normal phenomenon and does not require special treatment. 2. Abnormal phenomenon: when there is still a small amount of fluid in the drainage tube about one month after liver cyst surgery, and it is accompanied by purulent reaction, and there is fever, fever, body weakness, fluid exudation and so on after removing the drainage tube, then it will be considered abnormal, and it is usually related to infection. In addition, if the drainage fluid is judged to be of bile content, it is also necessary to consult the doctor for prompt treatment. If you find a small amount of fluid in the drain, you need to seek medical attention in time and under the guidance of a medical professional.