Female discharge like water may be caused by trichomonas vaginitis, cervical cancer, vaginal cancer and other diseases. 1. Trichomonas vaginitis: it is caused by Trichomonas vaginalis infection, which can be transmitted through sexual contact. Long-term use of antibiotics and frequent wearing of damp clothes can also induce this disease, and patients will have the phenomenon of thin secretion, which is manifested as secretion like water. 2. Cervical cancer: it is mainly caused by human papilloma virus infection. Factors such as decreased immunity and early sexual intercourse can also induce this disease, and patients may have abnormal vaginal discharge, which may show the symptom of watery secretion. 3. Vaginal cancer: it is related to human papilloma virus infection. Long-term damage to the vaginal mucosa, radiation therapy or genetic mutation can also lead to the occurrence of this disease, and the patient will have watery discharge, and may also have bleeding, pain and other symptoms. There are many reasons for women to have watery discharge, and it is recommended that patients be admitted to the hospital for examination to identify the specific cause and then treat the symptoms.