Sputum with a little blood inside may be related to dry weather and need to use a humidifier, but it may also be the cause of diseases such as tuberculosis or bronchial dilatation, which can be treated with medication. 1. Dry air. In cold weather, if the use of heating may lead to dry air, nasal bleeding is easy to flow to the throat, coughed up with sputum. You can choose a humidifier to moisten the air. 2. Tuberculosis. Tuberculosis bleeding is small, so there will be blood in the sputum, you can choose anti-tuberculosis drug treatment, such as isoniazid, rifampicin and so on. 3. Bronchial dilatation. Patients are prone to repeated coughing with hemoptysis, can be anti-infective treatment, such as cefoperazone sulbactam, etc., can also be combined with ambroxol to promote sputum discharge. Sputum with a little blood inside can also be seen in a variety of reasons, such as blood diseases, vasculitis, etc., based on this symptom can not accurately determine the cause, but also need to be combined with the medical history, other test results in order to make an accurate judgment, it is recommended that under the guidance of the doctor to use medication.